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Journal articles on the topic 'Quantum magnetism'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 April 2025

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1

Osborne, Ian S. "Cooperative quantum magnetism." Science 361, no. 6404 (August 23, 2018): 763.14–765. http://dx.doi.org/10.1126/science.361.6404.763-n.

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2

Freeman, Arthur J., and Kohji Nakamura. "Computational quantum magnetism: Role of noncollinear magnetism." Journal of Magnetism and Magnetic Materials 321, no. 7 (April 2009): 894–98. http://dx.doi.org/10.1016/j.jmmm.2008.11.107.

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3

Sachdev, Subir. "Quantum magnetism and criticality." Nature Physics 4, no. 3 (March 2008): 173–85. http://dx.doi.org/10.1038/nphys894.

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4

Inosov, D. S. "Quantum magnetism in minerals." Advances in Physics 67, no. 3 (July 3, 2018): 149–252. http://dx.doi.org/10.1080/00018732.2018.1571986.

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5

Blackburn, Elizabeth. "Magnetism, superconductors, quantum systems." Neutron News 24, no. 4 (October 2013): 6–7. http://dx.doi.org/10.1080/10448632.2013.831644.

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6

Castilla, G., S. Chakravarty, and V. J. Emery. "Quantum Magnetism of CuGeO3." Physical Review Letters 75, no. 9 (August 28, 1995): 1823–26. http://dx.doi.org/10.1103/physrevlett.75.1823.

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7

De Poortere, E. P., E. Tutuc, R. Pillarisetty, S. Melinte, and M. Shayegan. "Magnetism and pseudo-magnetism in quantum Hall systems." Physica E: Low-dimensional Systems and Nanostructures 20, no. 1-2 (December 2003): 123–32. http://dx.doi.org/10.1016/j.physe.2003.09.029.

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8

Stewart, A. M. "Gauge Invariant Magnetism." Australian Journal of Physics 50, no. 6 (1997): 1061. http://dx.doi.org/10.1071/p97024.

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An introduction is given to features of gauge invariance in classical and quantum mechanics that are of importance for magnetism in condensed matter systems. A version of quantum mechanics is described in which full electromagnetic gauge arbitrariness is displayed explicitly at every stage. The division of orbital magnetism into paramagnetism and diamagnetism is examined and it is shown that only by treating both of these on an equal footing can a gauge invariant treatment of magnetism be constructed.
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9

Schmaljohann, H., M. Erhard, J. Kronjägert, M. Kottke, S. Van Staa, J. J. Arlt, K. Bongs, and K. Sengstock. "Magnetism in ultracold quantum gases." Journal of Modern Optics 51, no. 12 (August 2004): 1829–41. http://dx.doi.org/10.1080/09500340408232494.

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10

Spielman, Ian B. "A route to quantum magnetism." Nature 472, no. 7343 (April 2011): 301–2. http://dx.doi.org/10.1038/nature10101.

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11

Samson, J. H. "Quantum effects in itinerant magnetism." Journal of Magnetism and Magnetic Materials 54-57 (February 1986): 983–84. http://dx.doi.org/10.1016/0304-8853(86)90344-6.

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12

Slot, M. R., Y. Maximenko, P. M. Haney, S. Kim, D. T. Walkup, E. Strelcov, Son T. Le, et al. "A quantum ruler for orbital magnetism in moiré quantum matter." Science 382, no. 6666 (October 6, 2023): 81–87. http://dx.doi.org/10.1126/science.adf2040.

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For almost a century, magnetic oscillations have been a powerful “quantum ruler” for measuring Fermi surface topology. In this study, we used Landau-level spectroscopy to unravel the energy-resolved valley-contrasting orbital magnetism and large orbital magnetic susceptibility that contribute to the energies of Landau levels of twisted double-bilayer graphene. These orbital magnetism effects led to substantial deviations from the standard Onsager relation, which manifested as a breakdown in scaling of Landau-level orbits. These substantial magnetic responses emerged from the nontrivial quantum geometry of the electronic structure and the large length scale of the moiré lattice potential. Going beyond traditional measurements, Landau-level spectroscopy performed with a scanning tunneling microscope offers a complete quantum ruler that resolves the full energy dependence of orbital magnetic properties in moiré quantum matter.
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13

KUZEMSKY, A. L. "QUANTUM PROTECTORATE AND MICROSCOPIC MODELS OF MAGNETISM." International Journal of Modern Physics B 16, no. 05 (February 20, 2002): 803–23. http://dx.doi.org/10.1142/s0217979202010002.

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Some physical implications involved in a new concept, termed the "quantum protectorate" (QP), are developed and discussed. This is done by considering the idea of quantum protectorate in the context of quantum theory of magnetism. It is suggested that the difficulties in the formulation of quantum theory of magnetism at the microscopic level, that are related to the choice of relevant models, can be understood better in the light of the QP concept. We argue that the difficulties in the formulation of adequate microscopic models of electron and magnetic properties of materials are intimately related to dual, itinerant and localized behaviour of electrons. We formulate a criterion of what basic picture describes best this dual behaviour. The main suggestion is that quasi-particle excitation spectra might provide distinctive signatures and good criteria for the appropriate choice of the relevant model.
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14

Machida, Masahiko, Keita Kobayashi, and Tomio Koyama. "Quantum phases in intrinsic Josephson junctions: Quantum magnetism analogy." Physica C: Superconductivity 491 (August 2013): 44–46. http://dx.doi.org/10.1016/j.physc.2013.02.004.

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15

Milošević, M. V., and D. Mandrus. "2D Quantum materials: Magnetism and superconductivity." Journal of Applied Physics 130, no. 18 (November 14, 2021): 180401. http://dx.doi.org/10.1063/5.0075774.

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16

Chandra, P., and P. Coleman. "Quantum spin nematics: Moment-free magnetism." Physical Review Letters 66, no. 1 (January 7, 1991): 100–103. http://dx.doi.org/10.1103/physrevlett.66.100.

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17

Weld, David M., and Wolfgang Ketterle. "Towards quantum magnetism with ultracold atoms." Journal of Physics: Conference Series 264 (January 10, 2011): 012017. http://dx.doi.org/10.1088/1742-6596/264/1/012017.

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18

Matsen, F. A. "Magnetism and spin-free quantum chemistry." International Journal of Quantum Chemistry 6, S6 (June 18, 2009): 411–17. http://dx.doi.org/10.1002/qua.560060644.

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19

Gulacsi, M. "Magnetism in rare-earth alloys." International Journal of Modern Physics B 28, no. 25 (September 9, 2014): 1430016. http://dx.doi.org/10.1142/s0217979214300163.

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Low dimensional rare-earth alloys reveal a rich phase diagram which always incorporate a ferromagnetic (FM) phase. Here we show that rare-earth ferromagnetism in low dimensions is due to double-exchange mechanism. We use the bosonized version of the one-dimensional Anderson lattice model in Toulouse limit to characterize the properties of this emerging FM phase. We give a comprehensive description of the FM ordering of the correlated electrons which appears at intermediate couplings and doping. Determine the critical properties of the phase transitions into the quantum disordered paramagnetic phases. The obtained phase transitions have been identified to be an order–disorder transition of the quantum random transverse-field Ising type.
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20

Nguyen, Duy Trinh, Phu Thuong Nhan Nguyen, Thien Hien Tran, Dai Hai Nguyen, Dai Viet N. Vo, Md Rafiqul Islam, Kwon Taek Lim, Sang Thanh Vo, and Long Giang Bach. "Functionalizing Multifunctional Fe3O4 Nanoparticle-Based Biocompatible, Magnetic and Photoluminescent Nanohybrids: Preparation and Characterization." Asian Journal of Chemistry 31, no. 4 (February 27, 2019): 767–72. http://dx.doi.org/10.14233/ajchem.2019.21617.

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A combination of ring-opening polymerization (ROP) and coordination chemistry methodology has been expanded for the synthesis of a multifunctional, biocompatible, magnetic, luminescent nanohybrid complex comprising magnetite (Fe3O4) nanoparticles (MNPs), poly(ε-caprolactone) (PCL) and europium ions (Eu3+). The structural and morphological characteristic of the nanohybrid intricate were studied by appropriate spectrum and physical researches. The superparamagnetic behaviour and unique Eu3+ fluorescence properties with a high emission intensity of MNP-PCL-Eu3+ were investigated via measurements with a superconducting quantum interference equipment magnetism and fluorescence spectroscopy.
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21

Georgii, Robert, and Klaus-Dieter Liss. "Quantum Beams for New Aspects in Magnetic Materials and Magnetism." Quantum Beam Science 3, no. 4 (November 25, 2019): 22. http://dx.doi.org/10.3390/qubs3040022.

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22

Persky, Eylon, Ilya Sochnikov, and Beena Kalisky. "Studying Quantum Materials with Scanning SQUID Microscopy." Annual Review of Condensed Matter Physics 13, no. 1 (March 10, 2022): 385–405. http://dx.doi.org/10.1146/annurev-conmatphys-031620-104226.

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Electronic correlations give rise to fascinating macroscopic phenomena such as superconductivity, magnetism, and topological phases of matter. Although these phenomena manifest themselves macroscopically, fully understanding the underlying microscopic mechanisms often requires probing on multiple length scales. Spatial modulations on the mesoscopic scale are especially challenging to probe, owing to the limited range of suitable experimental techniques. Here, we review recent progress in scanning superconducting quantum interference device (SQUID) microscopy. We demonstrate how scanning SQUID combines unmatched magnetic field sensitivity and highly versatile designs, by surveying discoveries in unconventional superconductivity, exotic magnetism, topological states, and more. Finally, we discuss how SQUID microscopy can be further developed to answer the increasing demand for imaging new quantum materials.
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23

Freericks and Strečka. "Strongly correlated electron systems and quantum magnetism." Condensed Matter Physics 23, no. 4 (December 2020): 40101. http://dx.doi.org/10.5488/cmp.23.40101.

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24

Tejada, J., X. X. Zhang, and A. García. "Quantum relaxation in magnetism and high-Tcsuperconductors." Physica Scripta T55 (January 1, 1994): 131–35. http://dx.doi.org/10.1088/0031-8949/1994/t55/023.

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25

Zhu, Xingchuan, Huaiming Guo, and Shiping Feng. "Quantum magnetism of topologically-designed graphene nanoribbons." Journal of Physics: Condensed Matter 31, no. 50 (September 17, 2019): 505601. http://dx.doi.org/10.1088/1361-648x/ab3f81.

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26

Yin, Jia-Xin, Wenlong Ma, Tyler A. Cochran, Xitong Xu, Songtian S. Zhang, Hung-Ju Tien, Nana Shumiya, et al. "Quantum-limit Chern topological magnetism in TbMn6Sn6." Nature 583, no. 7817 (July 2020): 533–36. http://dx.doi.org/10.1038/s41586-020-2482-7.

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27

Mirbt, S., B. Johansson, and H. L. Skriver. "Quantum-well-driven magnetism in thin films." Physical Review B 53, no. 20 (May 15, 1996): R13310—R13313. http://dx.doi.org/10.1103/physrevb.53.r13310.

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28

Farghadan, Rouhollah. "Edge magnetism in triangular silicene quantum dots." Journal of Magnetism and Magnetic Materials 466 (November 2018): 301–5. http://dx.doi.org/10.1016/j.jmmm.2018.07.004.

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29

Suzuki, Takeru, Hiroshi Imamura, Masahiko Hayashi, and Hiromichi Ebisawa. "Orbital Magnetism in Three-Dimensional Quantum Dots." Journal of the Physical Society of Japan 71, no. 5 (May 15, 2002): 1242–45. http://dx.doi.org/10.1143/jpsj.71.1242.

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30

Rand, Stephen C. "Quantum theory of coherent transverse optical magnetism." Journal of the Optical Society of America B 26, no. 12 (November 3, 2009): B120. http://dx.doi.org/10.1364/josab.26.00b120.

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31

Hernández-Sarria, J. J., A. Argüelles, and K. Rodríguez. "Quantum magnetism in spin-3/2 chains." Journal of Physics: Conference Series 614 (July 3, 2015): 012005. http://dx.doi.org/10.1088/1742-6596/614/1/012005.

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32

Lewenstein, M., and A. Sanpera. "PHYSICS: Probing Quantum Magnetism with Cold Atoms." Science 319, no. 5861 (January 18, 2008): 292–93. http://dx.doi.org/10.1126/science.1153723.

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33

Richter, K., and B. Mehlig. "Orbital magnetism of classically chaotic quantum systems." Europhysics Letters (EPL) 41, no. 6 (March 15, 1998): 587–92. http://dx.doi.org/10.1209/epl/i1998-00197-2.

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34

Grazhulis, V. A. "On magnetism of quantum “dots” and “channels”." Solid State Communications 79, no. 11 (September 1991): 917–21. http://dx.doi.org/10.1016/0038-1098(91)90443-y.

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35

Huang, Xiaoyang, Taige Wang, Shang Liu, Hong-Ye Hu, and Yi-Zhuang You. "Quantum Magnetism in Wannier-Obstructed Mott Insulators." Crystals 14, no. 2 (February 9, 2024): 176. http://dx.doi.org/10.3390/cryst14020176.

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We develop a strong coupling approach towards quantum magnetism in Mott insulators for Wannier-obstructed bands. Despite the lack of Wannier orbitals, electrons can still singly occupy a set of exponentially localized but nonorthogonal orbitals to minimize the repulsive interaction energy. We develop a systematic method to establish an effective spin model from the electron Hamiltonian using a diagrammatic approach. The nonorthogonality of the Mott basis gives rise to multiple new channels of spin-exchange (or permutation) interactions beyond Hartree–Fock and superexchange terms. We apply this approach to a Kagome lattice model of interacting electrons in Wannier-obstructed bands (including both Chern bands and fragile topological bands). Due to the orbital nonorthogonality, as parameterized by the nearest-neighbor orbital overlap g, this model exhibits stable ferromagnetism up to a finite bandwidth W∼Ug, where U is the interaction strength. This provides an explanation for the experimentally observed robust ferromagnetism in Wannier-obstructed bands. The effective spin model constructed through our approach also opens up the possibility for frustrated quantum magnetism around the ferromagnet-antiferromagnet crossover in Wannier-obstructed bands.
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36

Rabelo, Renato, Salah-Eddine Stiriba, Danielle Cangussu, Cynthia L. M. Pereira, Nicolás Moliner, Rafael Ruiz-García, Joan Cano, Juan Faus, Yves Journaux, and Miguel Julve. "When Molecular Magnetism Meets Supramolecular Chemistry: Multifunctional and Multiresponsive Dicopper(II) Metallacyclophanes as Proof-of-Concept for Single-Molecule Spintronics and Quantum Computing Technologies?" Magnetochemistry 6, no. 4 (December 4, 2020): 69. http://dx.doi.org/10.3390/magnetochemistry6040069.

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Molecular magnetism has made a long journey, from the fundamental studies on through-ligand electron exchange magnetic interactions in dinuclear metal complexes with extended organic bridges to the more recent exploration of their electron spin transport and quantum coherence properties. Such a field has witnessed a renaissance of dinuclear metallacyclic systems as new experimental and theoretical models for single-molecule spintronics and quantum computing, due to the intercrossing between molecular magnetism and metallosupramolecular chemistry. The present review reports a state-of-the-art overview as well as future perspectives on the use of oxamato-based dicopper(II) metallacyclophanes as promising candidates to make multifunctional and multiresponsive, single-molecule magnetic (nano)devices for the physical implementation of quantum information processing (QIP). They incorporate molecular magnetic couplers, transformers, and wires, controlling and facilitating the spin communication, as well as molecular magnetic rectifiers, transistors, and switches, exhibiting a bistable (ON/OFF) spin behavior under external stimuli (chemical, electronic, or photonic). Special focus is placed on the extensive research work done by Professor Francesc Lloret, an outstanding chemist, excellent teacher, best friend, and colleague, in recognition of his invaluable contributions to molecular magnetism on the occasion of his 65th birthday.
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37

Zhou, Yungang, Geng Cheng, and Jing Li. "Coexistence of Co doping and strain on arsenene and antimonene: tunable magnetism and half-metallic behavior." RSC Advances 8, no. 3 (2018): 1320–27. http://dx.doi.org/10.1039/c7ra11163k.

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38

Scheie, Allen, Jonas Kindervater, Shu Zhang, Hitesh J. Changlani, Gabriele Sala, Georg Ehlers, Andre Heinemann, Gregory S. Tucker, Seyed M. Koohpayeh, and Collin Broholm. "Multiphase magnetism in Yb2Ti2O7." Proceedings of the National Academy of Sciences 117, no. 44 (October 23, 2020): 27245–54. http://dx.doi.org/10.1073/pnas.2008791117.

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We use neutron scattering to show that ferromagnetism and antiferromagnetism coexist in the low T state of the pyrochlore quantum magnetYb2Ti2O7. While magnetic Bragg peaks evidence long-range static ferromagnetic order, inelastic scattering shows that short-range correlated antiferromagnetism is also present. Small-angle neutron scattering provides direct evidence for mesoscale magnetic structure that we associate with metastable antiferromagnetism. Classical Monte Carlo simulations based on exchange interactions inferred from⟨111⟩-oriented high-field spin wave measurements confirm that antiferromagnetism is metastable within the otherwise ferromagnetic ground state. The apparent lack of coherent spin wave excitations and strong sensitivity to quenched disorder characterizingYb2Ti2O7is a consequence of this multiphase magnetism.
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39

Wang, Haodong, Peihan Lei, Xiaoyu Mao, Xi Kong, Xiangyu Ye, Pengfei Wang, Ya Wang, et al. "Magnetic Phase Transition in Two-Dimensional CrBr3 Probed by a Quantum Sensor." Chinese Physics Letters 39, no. 4 (April 1, 2022): 047601. http://dx.doi.org/10.1088/0256-307x/39/4/047601.

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Recently, magnetism in two-dimensional (2D) van der Waals (vdW) materials has attracted wide interests. It is anticipated that these materials will stimulate discovery of new physical phenomena and novel applications. The capability to quantitatively measure the magnetism of 2D magnetic vdW materials is essential to understand these materials. Here we report on quantitative measurements of ferromagnetic-to-paramagnetic phase transition of an atomically thin (down to 11 nm) vdW magnet, namely CrBr3, with a Curie point of 37.5 K. This experiment demonstrates that surface magnetism can be quantitatively investigated, which is useful for a wide variety of potential applications.
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40

Mi, Bin Zhou, Yong Hong Xue, Huai Yu Wang, Yun Song Zhou, and Xiao Lan Zhong. "Study of Magnetism of Two-Dimensional Ferromagnetic Graphene." Advanced Materials Research 601 (December 2012): 89–93. http://dx.doi.org/10.4028/www.scientific.net/amr.601.89.

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In this paper, the magnetic properties of ferromagnetic graphene nanostructures, especially the dependence of the magnetism on finite temperature, are investigated by use of the many-body Green’s function method of quantum statistical theory. The spontaneous magnetization increases with spin quantum number, and decreases with temperature. Curie temperature increases with exchange parameter J or the strength K2 of single-ion anisotropy and spin quantum number. The Curie temperature TC is directly proportional to the exchange parameter J. The spin-wave energy drops with temperature rising, and becomes zero as temperature reaches Curie temperature. As J(p,q)=0, ω1=ω2, the spin wave energy is degenerate, and the corresponding vector k=(p, q) is called the Dirac point. This study contributes to theoretical analysis for pristine two-dimensional magnetic nanomaterials that may occur in advanced experiments.
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41

LEE, SungBin. "Frontiers of Quantum Magnetic Materials." Physics and High Technology 31, no. 9 (September 30, 2022): 2–6. http://dx.doi.org/10.3938/phit.31.027.

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The history of magnetism goes back to earlier than 600 b.c., but only in 20th century, people have started to understand it’s origin. Although the word ‘magnet’ may sound very familiar to you, it’s quantum nature and deep physics leads us to discover amazing phenomena. This article introduces recent frontiers of magnetic materials particularly focusing on ‘magnetic frustration and quantum spin liquids’ and discuss our current understanding.
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42

Jadaun, Priyamvada, and Bart Soreé. "Review of Orbital Magnetism in Graphene-Based Moiré Materials." Magnetism 3, no. 3 (August 28, 2023): 245–58. http://dx.doi.org/10.3390/magnetism3030019.

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Recent years have seen the emergence of moiré materials as an attractive platform for observing a host of novel correlated and topological phenomena. Moiré heterostructures are generated when layers of van der Waals materials are stacked such that consecutive layers are slightly mismatched in their lattice orientation or unit cell size. This slight lattice mismatch gives rise to a long-wavelength moiré pattern that modulates the electronic structure and leads to novel physics. The moiré superlattice results in flat superlattice bands, electron–electron interactions and non-trivial topology that have led to the observation of superconductivity, the quantum anomalous Hall effect and orbital magnetization, among other interesting properties. This review focuses on the experimental observation and theoretical analysis of orbital magnetism in moiré materials. These systems are novel in their ability to host magnetism that is dominated by the orbital magnetic moment of Bloch electrons. This orbital magnetic moment is easily tunable using external electric fields and carrier concentration since it originates in the quantum anomalous Hall effect. As a result, the orbital magnetism found in moiré superlattices can be highly attractive for a wide array of applications including spintronics, ultra-low-power magnetic memories, spin-based neuromorphic computing and quantum information technology.
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43

Mejía-López, J., Ana Mejía-López, and J. Mazo-Zuluaga. "Uniaxial magnetic anisotropy energy of bimetallic Co–Ni clusters from a first-principles perspective." Physical Chemistry Chemical Physics 20, no. 24 (2018): 16528–39. http://dx.doi.org/10.1039/c8cp01372a.

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44

MANOHARAN, H. "MAGNETISM AT THE SPATIAL LIMIT." International Journal of Modern Physics B 16, no. 20n22 (August 30, 2002): 3272. http://dx.doi.org/10.1142/s0217979202014140.

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In this talk I will survey our recent experimental results in the detection and manipulation of magnetism at the spatial limit. Our experiments rely on atom manipulation techniques and scanning tunneling microscopy at low temperatures to enable atomic-scale imaging and control. We have observed "quantum mirages" in focusing devices of order 10 nanometers in size, built by assembling structures out of individual atoms. We have directly imaged the spin perturbations due to isolated magnetic moments on a metal surface. The detection of this localized magnetism can then be utilized in a type of teleportation experiment, in which the spectroscopic signature of an atom is sampled and projected to a remote location by means of a surrounding sea of electrons confined in an engineered nanostructure. The quantum mirage thus cast by a single magnetic atom can be coherently refocused at a distinct point where it is detected as a phantom atom around which the electronic structure mimics that at the real atom. Once materialized, this phantom can interact with real matter in intriguing ways. We have constructed other nanoscale magnetic structures which either elucidate the coupling between isolated moments or provide a mechanism for controlling and exploiting spin coupling over long distances. We have also been developing novel communication methods based on the fundamental effects we have discovered.
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45

Liu, Liang, Zezhou Lin, Jifan Hu, and Xi Zhang. "Full quantum search for high Tc two-dimensional van der Waals ferromagnetic semiconductors." Nanoscale 13, no. 17 (2021): 8137–45. http://dx.doi.org/10.1039/d0nr08687h.

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46

Vallury, Harish J., Michael A. Jones, Gregory A. L. White, Floyd M. Creevey, Charles D. Hill, and Lloyd C. L. Hollenberg. "Noise-robust ground state energy estimates from deep quantum circuits." Quantum 7 (September 11, 2023): 1109. http://dx.doi.org/10.22331/q-2023-09-11-1109.

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In the lead up to fault tolerance, the utility of quantum computing will be determined by how adequately the effects of noise can be circumvented in quantum algorithms. Hybrid quantum-classical algorithms such as the variational quantum eigensolver (VQE) have been designed for the short-term regime. However, as problems scale, VQE results are generally scrambled by noise on present-day hardware. While error mitigation techniques alleviate these issues to some extent, there is a pressing need to develop algorithmic approaches with higher robustness to noise. Here, we explore the robustness properties of the recently introduced quantum computed moments (QCM) approach to ground state energy problems, and show through an analytic example how the underlying energy estimate explicitly filters out incoherent noise. Motivated by this observation, we implement QCM for a model of quantum magnetism on IBM Quantum hardware to examine the noise-filtering effect with increasing circuit depth. We find that QCM maintains a remarkably high degree of error robustness where VQE completely fails. On instances of the quantum magnetism model up to 20 qubits for ultra-deep trial state circuits of up to 500 CNOTs, QCM is still able to extract reasonable energy estimates. The observation is bolstered by an extensive set of experimental results. To match these results, VQE would need hardware improvement by some 2 orders of magnitude on error rates.
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47

Qiu, Gang, Hung-Yu Yang, Su Kong Chong, Yang Cheng, Lixuan Tai, and Kang L. Wang. "Manipulating Topological Phases in Magnetic Topological Insulators." Nanomaterials 13, no. 19 (September 27, 2023): 2655. http://dx.doi.org/10.3390/nano13192655.

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Magnetic topological insulators (MTIs) are a group of materials that feature topological band structures with concurrent magnetism, which can offer new opportunities for technological advancements in various applications, such as spintronics and quantum computing. The combination of topology and magnetism introduces a rich spectrum of topological phases in MTIs, which can be controllably manipulated by tuning material parameters such as doping profiles, interfacial proximity effect, or external conditions such as pressure and electric field. In this paper, we first review the mainstream MTI material platforms where the quantum anomalous Hall effect can be achieved, along with other exotic topological phases in MTIs. We then focus on highlighting recent developments in modulating topological properties in MTI with finite-size limit, pressure, electric field, and magnetic proximity effect. The manipulation of topological phases in MTIs provides an exciting avenue for advancing both fundamental research and practical applications. As this field continues to develop, further investigations into the interplay between topology and magnetism in MTIs will undoubtedly pave the way for innovative breakthroughs in the fundamental understanding of topological physics as well as practical applications.
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48

Moses, Amos. "Frustrated Magnetism: A Case Study of Geometric Frustration." Advanced Journal of Science, Technology and Engineering 3, no. 1 (February 22, 2023): 17–33. http://dx.doi.org/10.52589/ajste-gwzic1wk.

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In this research work, frustrations arising from the geometries of triangular lattices have been studied with the aid of Ising and Heisenberg models. The study reveals that geometrical frustrations can generate multiple degeneracies in the ground state. The quantum spin flip terms in the Heisenberg model are observed to play a vital role in the partial lifting up of these degeneracies. Hence, multiple degeneracies as consequence of frustrations are more pronounced for the Ising systems, which are devoid of quantum fluctuations. The observed six- and four-fold ground state degeneracies at zero field for three spins Ising and Heisenberg systems respectively are broken down to half at finite longitudinal fields. For this three-spin system, quantum phase transitions (QPT) are observed at critical longitudinal fields of J and 1.5J respectively for the Ising and Heisenberg models. At these critical fields, the ground states are observed to shift from quasi-antiferromagnet to ferromagnet. However, for the Heisenberg three-spin system in the presence of a transverse field, no transition is observed.
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49

Krishnan, Kannan M. "Magnetism on a Microscopic Scale." MRS Bulletin 20, no. 10 (October 1995): 24–28. http://dx.doi.org/10.1557/s0883769400045309.

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Tremendous progress has been made in the field of magnetic-materials research and technology over the past few years. Superior properties and novel scientific questions arise from our ability to either synthesize artificial structures or tailor microstructures at the appropriate length scale. The development of enhanced macroscopic properties in such materials requires, in addition to synthesis, that the magnetic microstructure be quantitatively determined and its dependence on the physical/chemical microstructure at the appropriate length scale be understood. Such studies are also motivated by the technologies of information storage, magnetic and magnetooptic recording, sensors, and magnetic devices. While these applications have been the focus of earlier issues of the MRS Bulletin, here we emphasize the physics, materials science, novel magnetic measurements, and micromagnetics, as well as the implications of this work on emerging technologies.Magnetism, subtle in its manifestations, is electronically driven but weak compared to electrostatic interactions. It is quantum-mechanical in nature with its origins in the Pauli exclusion principle and the existence of electron spin. However, it is known for a variety of both classical and quantum-mechanical effects stemming from both short- and long-range forces. It has a wide association with what is traditionally known as “microstructure” or the morphological arrangement of phases, grains, or individual atoms themselves. These factors are in part the reason for the richness of structures and properties encountered in magnetic systems from which many useful engineering and technical applications arise. They are also in part the reason why magnetism remains poorly understood and why many fundamental questions remain unanswered.
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50

Li, Yongjian, Taishan Wang, Haibing Meng, Chong Zhao, Mingzhe Nie, Li Jiang, and Chunru Wang. "Controlling the magnetic properties of dysprosium metallofullerene within metal–organic frameworks." Dalton Transactions 45, no. 48 (2016): 19226–29. http://dx.doi.org/10.1039/c6dt04180a.

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