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Journal articles on the topic 'Ferromagnetic Quantum Dots'

Author: Grafiati

Published: 7 September 2023

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1

GAO, PAN, SUHANG LIU, LIN TIAN, and TIANXING MA. "QUANTUM MONTE CARLO STUDY OF MAGNETIC CORRELATION IN GRAPHENE NANORIBBONS AND QUANTUM DOTS." Modern Physics Letters B 27, no. 21 (2013): 1330016. http://dx.doi.org/10.1142/s0217984913300160.

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To realize the application of spintronics, possible magnetism in graphene-based material is an important issue to be addressed. At the tight banding level of armchair graphene nanoribbons, there are two flat bands in the band structure, two Van Hove singularities in the density of states, and the introducing of the next-nearest-neighbor hopping term cause high asymmetry in them, which plays a key role in the behavior of magnetic correlation. We further our studies within determinant quantum Monte Carlo simulation to treat the electron–electron interaction. It is found that the armchair graphen

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2

Omariy, Aiman Al, and Reim Almotiriz y. "QUANTUM DOTS IN FERROMAGNETIC HEISENBERG MODEL." EPH - International Journal of Applied Science 2, no. 4 (2016): 1–5. http://dx.doi.org/10.53555/eijas.v2i4.24.

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Quantum Dots (QDs) are semiconductor-nanostructure materials which are also called arti cial atoms. QDs are classi ed as ferromagnetic material. Theoretically, Heisenberg model is regarded as a good model in describing these QDs. We applied Spin Wave Theory (SWT) on the above mentioned model to explore the physical properties of these materials, such as ground state energy, excitation energy and magnetization. We found that the ground state energy "g increased with the applied external magnetic eld B as B0:3. A phase transition was also observed around B~1T, which indicate a transition from si

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3

Ma, Xi Ying. "Fabrication of Ferromagnetic Ge Quantum Dots Material." Advanced Materials Research 531 (June 2012): 71–74. http://dx.doi.org/10.4028/www.scientific.net/amr.531.71.

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GeMn magnetic quantum dots (QDs) material were grown with a GeH4/Ar mixed gas under a constant flowing at 400°C by means of plasma enhanced chemical vapor deposition (PECVD) process, then doped with Mn doped using magnetic sputtering technique and annealed at 600 C. The QDs with a Ge0.88Mn0.12 structure derived from the energy spectrum show a wide opening hysteresis loops with a large remnant magnetizations Mr are 0.1410-4 and 0.2510-4 emu/g for the as grown and the annealed samples. Moreover, the magnetic QDs show high quality voltage-current (I-V) and voltage-capacitance (C-V) properties.

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4

Xiu, Faxian. "Magnetic Mn-Doped Ge Nanostructures." ISRN Condensed Matter Physics 2012 (May 7, 2012): 1–25. http://dx.doi.org/10.5402/2012/198590.

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With the seemly limit of scaling on CMOS microelectronics fast approaching, spintronics has received enormous attention as it promises next-generation nanometric magnetoelectronic devices; particularly, the electric field control of ferromagnetic transition in dilute magnetic semiconductor (DMS) systems offers the magnetoelectronic devices a potential for low power consumption and low variability. Special attention has been given to technologically important group IV semiconductor based DMSs, with a prominent position for Mn doped Ge. In this paper, we will first review the current theoretical

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5

MA, QIONG, TAO TU, LI WANG, et al. "SUBSTRATE MODULATED GRAPHENE QUANTUM DOTS." Modern Physics Letters B 26, no. 25 (2012): 1250162. http://dx.doi.org/10.1142/s021798491250162x.

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We propose a method to use gapped graphene as barriers to confine electrons in gapless graphene and form a good quantum dot, which can be realized on an oxygen-terminated SiO 2 substrate partly hydrogen-passivated. In particular, we use deposited ferromagnetic insulators as contacts which give rise to spin-dependent energy spectrum and transport properties. Furthermore, we upgrade this method to form two-dimensional quantum dot arrays, whose coupling strength between neighboring dots can be uniquely anisotropic. Compared to complexity of other approaches to form quantum dot in graphene, the se

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6

Xiu, Faxian, Igor V. Ovchinnikov, Pramey Upadhyaya, et al. "Voltage-controlled ferromagnetic order in MnGe quantum dots." Nanotechnology 21, no. 37 (2010): 375606. http://dx.doi.org/10.1088/0957-4484/21/37/375606.

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7

Ramlan, Dinna G., Steven J. May, Jian-Guo Zheng, Jonathan E. Allen, Bruce W. Wessels, and Lincoln J. Lauhon. "Ferromagnetic Self-Assembled Quantum Dots on Semiconductor Nanowires." Nano Letters 6, no. 1 (2006): 50–54. http://dx.doi.org/10.1021/nl0519276.

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8

Yang, J. Y., K. S. Yoon, Y. H. Do, et al. "Ferromagnetic quantum dots formed by external laser irradiation." Journal of Applied Physics 93, no. 10 (2003): 8766–68. http://dx.doi.org/10.1063/1.1558600.

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9

Yan, Wensheng, Qinghua Liu, Chao Wang, et al. "Realizing Ferromagnetic Coupling in Diluted Magnetic Semiconductor Quantum Dots." Journal of the American Chemical Society 136, no. 3 (2014): 1150–55. http://dx.doi.org/10.1021/ja411900w.

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10

Martinek, J., Y. Utsumi, H. Imamura, J. Barnaś, S. Maekawa, and G. Schön. "Kondo effect in quantum dots coupled to ferromagnetic electrodes." Physica E: Low-dimensional Systems and Nanostructures 18, no. 1-3 (2003): 75–76. http://dx.doi.org/10.1016/s1386-9477(02)00980-3.

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11

Yoon, I. T., S. W. Lee, T. W. Kang, Dongwan Koh, and D. J. Fu. "Ferromagnetic Properties of Mn-Implanted Ge∕Si Quantum Dots." Journal of The Electrochemical Society 155, no. 1 (2008): K1. http://dx.doi.org/10.1149/1.2800756.

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12

Aguiar Hualde, J. M., G. Chiappe, and E. V. Anda. "Kondo spin splitting in quantum dots with ferromagnetic leads." physica status solidi (c) 3, no. 11 (2006): 3778–81. http://dx.doi.org/10.1002/pssc.200671558.

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13

Phuong, Luong Thi Kim, and An Manh Nguyen. "Epitaxial Growth of High Curie-Temperature Ge1-xMnx quantum dots on Si(001) by auto-assembly." Communications in Physics 24, no. 1 (2014): 69. http://dx.doi.org/10.15625/0868-3166/24/1/3477.

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We report on successful growth of epitaxial and high Curie-temperature Ge1-xMnx quantum dots on Si (001) substrates using the auto-assembled approach. By reducing the growth temperature down to 400 °C, we show that the Mn diffusion into the Si substrate can be neglected. No indication of secondary phases or clusters was observed. Ge1-xMnx quantum dots were found to be epitaxial and perfectly coherent to the Si substrate. We also observe ferromagnetic ordering in quantum dots at a temperature higher 320 K. It is believed that single-crystalline quantum dots exhibiting a high Curie temperature a

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14

Guo-Hui, Ding, and Ye Fei. "Quantum Phase Transition and Ferromagnetic Spin Correlation in Parallel Double Quantum Dots." Chinese Physics Letters 24, no. 10 (2007): 2926–29. http://dx.doi.org/10.1088/0256-307x/24/10/059.

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15

Pan, Hui, Ziyu Chen, Sufen Zhao, and Rong Lü. "Quantum spin and charge pumping through double quantum dots with ferromagnetic leads." Physics Letters A 375, no. 23 (2011): 2239–45. http://dx.doi.org/10.1016/j.physleta.2011.04.034.

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16

Yadav, Amar Nath, Jasleen K. Bindra, Narendra Jakhar, and Kedar Singh. "Switching-on superparamagnetism in diluted magnetic Fe(iii) doped CdSe quantum dots." CrystEngComm 22, no. 10 (2020): 1738–45. http://dx.doi.org/10.1039/c9ce01391a.

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17

BHATT, R. N., and ERIK NIELSEN. "FERROMAGNETISM IN DOPED SEMICONDUCTORS WITHOUT MAGNETIC IONS." International Journal of Modern Physics B 22, no. 25n26 (2008): 4595–606. http://dx.doi.org/10.1142/s0217979208050358.

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While ferromagnetism has been obtained above 100 K in doped semiconductors with magnetic ions such as Ga 1−x Mn x As , bulk doped semiconductors in the absence of magnetic ions have shown no tendency towards ferromagnetism. We re-examine the nonmagnetic doped semiconductor system at low carrier densities in terms of a generalized Hubbard model. Using exact diagonalization of the many-body Hamiltonian for finite clusters, we find that the system exhibits significant ferromagnetic tendencies at nanoscales, in a region of parameter space not accessible to bulk systems, but achievable in quantum d

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18

Zhao, Jianing, Xiaoli Li, and Zhiguo Li. "Synthesis of Co-Doped CdS Nanocrystals by Direct Thermolysis of Cadmium and Cobalt Thiolate Clusters." Journal of Nanomaterials 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/109734.

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Co-doped CdS (Co:CdS) nanocrystals with controllable morphology (quantum dots and nanorods) were easily synthesized by direct thermolysis of (Me4N)2[Co4(SC6H5)10] and (Me4N)4[S4Cd10(SPh)16] under different precursor concentration, in virtue of the ions exchange of molecular clusters. The Co:CdS quantum dots were produced under low precursor concentration, and the Co:CdS nanorods could be obtained under higher precursor concentration. The Co-doping effect on the structure, growth process, and property of CdS nanocrystals was also investigated. The results indicated that the Co-doping was favora

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19

Sriharsha, Karumuri, Le Duc Anh, and Masaaki Tanaka. "Ferromagnetic Fe-doped InAs quantum dots with high Curie temperature." Applied Physics Express 14, no. 8 (2021): 083002. http://dx.doi.org/10.35848/1882-0786/ac1182.

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20

Chen, Lin, Fengchun Hu, Hengli Duan, et al. "Intrinsic ferromagnetic coupling in Co3O4 quantum dots activatedby graphene hybridization." Applied Physics Letters 108, no. 25 (2016): 252402. http://dx.doi.org/10.1063/1.4954715.

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21

Yoshizumi, Hitoshi, Tomoko Kita, and Sei-ichiro Suga. "Multiorbital Kondo effect in quantum dots coupled to ferromagnetic leads." Physica E: Low-dimensional Systems and Nanostructures 42, no. 4 (2010): 868–70. http://dx.doi.org/10.1016/j.physe.2009.10.026.

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22

Ca, N. X., N. T. Hien, P. N. Loan, et al. "Optical and Ferromagnetic Properties of Ni-Doped CdTeSe Quantum Dots." Journal of Electronic Materials 48, no. 4 (2019): 2593–99. http://dx.doi.org/10.1007/s11664-019-07017-9.

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23

Pan, Lei, YuanDong Wang, ZhenHua Li, JianHua Wei, and YiJing Yan. "Kondo effect in double quantum dots with ferromagnetic RKKY interaction." Journal of Physics: Condensed Matter 29, no. 2 (2016): 025601. http://dx.doi.org/10.1088/0953-8984/29/2/025601.

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24

Swain, Akshaya Kumar, Dan Li, and Dhirendra Bahadur. "UV-assisted production of ferromagnetic graphitic quantum dots from graphite." Carbon 57 (June 2013): 346–56. http://dx.doi.org/10.1016/j.carbon.2013.01.082.

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25

ABDELRAZEK, AHMED S., WALID A. ZEIN, and ADEL H. PHILLIPS. "SPIN-DEPENDENT GOOS–HANCHEN EFFECT IN SEMICONDUCTING QUANTUM DOTS." SPIN 03, no. 02 (2013): 1350007. http://dx.doi.org/10.1142/s2010324713500070.

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The present research is devoted to the investigation of the spin-dependant Goos–Hanchen phase shift in quantum nanodevice. This nanodevice is modeled as semiconducting quantum dot coupled to two ferromagnetic leads. The spin transport through such nanodevice is conducted under the effect of both magnetic field and the photon energy of the induced ac-field. The angle of incidence of electrons is taken into account. Results show that the Goos–Hanchen phase shift of spin-up electrons is different from that of spin-down electron. Also, spin polarization and giant magneto-resistance are strongly de

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26

Yang, Maolong, Liming Wang, Jie You, et al. "Growth and Magnetism of MnxGe1−x Heteroepitaxial Quantum Dots Grown on Si Wafer by Molecular Beam Epitaxy." Crystals 10, no. 6 (2020): 534. http://dx.doi.org/10.3390/cryst10060534.

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Self-assembled MnGe quantum dots (QDs) were grown on Si (001) substrates using molecular beam epitaxy with different growth temperatures and Ge deposition thicknesses to explore the interaction among Mn doping, Ge deposition, the formation of intermetallics, and the ferromagnetism of QDs. With the introduction of Mn atoms, the QDs become large and the density significantly decreases due to the improvement in the surface migration ability of Ge atoms. The growth temperature is one of the most important factors deciding whether intermetallic phases form between Mn and Ge. We found that Mn atoms

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27

Trocha, Piotr, Emil Siuda, and Ireneusz Weymann. "Spin-polarized transport in quadruple quantum dots attached to ferromagnetic leads." Journal of Magnetism and Magnetic Materials 546 (March 2022): 168835. http://dx.doi.org/10.1016/j.jmmm.2021.168835.

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28

Weymann, I., and J. Barnaś. "Transport through two-level quantum dots weakly coupled to ferromagnetic leads." Journal of Physics: Condensed Matter 19, no. 9 (2007): 096208. http://dx.doi.org/10.1088/0953-8984/19/9/096208.

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29

Cong-Hua, Yan, Wu Shao-Quan, Huang Rui, and Sun Wei-Li. "Spin-Flip Process through Double Quantum Dots Coupled to Ferromagnetic Leads." Chinese Physics Letters 23, no. 7 (2006): 1888–91. http://dx.doi.org/10.1088/0256-307x/23/7/064.

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30

Weymann, I., and C. P. Moca. "Frequency-dependent conductance of Kondo quantum dots coupled to ferromagnetic leads." Journal of Applied Physics 109, no. 7 (2011): 07C704. http://dx.doi.org/10.1063/1.3544491.

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31

Pan, Hui, and Rong Lü. "Spin accumulation in coupled quantum dots with ferromagnetic and superconducting electrodes." Physica B: Condensed Matter 403, no. 18 (2008): 3125–29. http://dx.doi.org/10.1016/j.physb.2008.03.022.

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32

Wilczyński, M., R. Świrkowicz, W. Rudziński, J. Barnaś, and V. Dugaev. "Quantum dots attached to ferromagnetic leads: possibility of new spintronic devices." Journal of Magnetism and Magnetic Materials 290-291 (April 2005): 209–12. http://dx.doi.org/10.1016/j.jmmm.2004.11.184.

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33

Braun, M., J. König, and J. Martinek. "Hanle effect in transport through quantum dots coupled to ferromagnetic leads." Europhysics Letters (EPL) 72, no. 2 (2005): 294–300. http://dx.doi.org/10.1209/epl/i2005-10230-0.

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34

Weymann, I. "Cotunneling through two-level quantum dots weakly coupled to ferromagnetic leads." Europhysics Letters (EPL) 76, no. 6 (2006): 1200–1206. http://dx.doi.org/10.1209/epl/i2006-10398-7.

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35

Wójcik, K. P., I. Weymann, and J. Barnaś. "Asymmetry-induced effects in Kondo quantum dots coupled to ferromagnetic leads." Journal of Physics: Condensed Matter 25, no. 7 (2013): 075301. http://dx.doi.org/10.1088/0953-8984/25/7/075301.

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36

Ebrahim, Sh, W. Ramadan, and M. Ali. "Structural, optical and ferromagnetic properties of cobalt doped CdTe quantum dots." Journal of Materials Science: Materials in Electronics 27, no. 4 (2015): 3826–33. http://dx.doi.org/10.1007/s10854-015-4229-z.

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37

Ma, Xiying, and Caoxin Lou. "The ferromagnetic properties of Ge magnetic quantum dots doped with Mn." Applied Surface Science 258, no. 7 (2012): 2906–9. http://dx.doi.org/10.1016/j.apsusc.2011.11.005.

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38

Li, Junyao, Xiaofeng Liu, Lingyun Wan, Xinming Qin, Wei Hu, and Jinlong Yang. "Mixed magnetic edge states in graphene quantum dots." Multifunctional Materials 5, no. 1 (2022): 014001. http://dx.doi.org/10.1088/2399-7532/ac44fe.

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Abstract Graphene quantum dots (GQDs) exhibit abundant magnetic edge states with promising applications in spintronics. Hexagonal zigzag GQDs possess a ground state with an antiferromagnetic (AFM) inter-edge coupling, followed by a metastable state with ferromagnetic (FM) inter-edge coupling. By analyzing the Hubbard model and performing large-scale spin-polarized density functional theory calculations containing thousands of atoms, we predict a series of new mixed magnetic edge states of GQDs arising from the size effect, namely mix-n, where n is the number of spin arrangement parts at each e

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39

Świrkowicz, R., W. Rudziński, M. Wilczyński, M. Wawrzyniak, and J. Barnaś. "Kondo effect in quantum dots coupled to ferromagnetic leads with noncollinear magnetizations." Physica B: Condensed Matter 378-380 (May 2006): 940–41. http://dx.doi.org/10.1016/j.physb.2006.01.358.

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40

Ponnar, M., K. Pushpanathan, R. Santhi, and S. Ravichandran. "Enhanced supercapacitor performance and ferromagnetic behavior of Ni-doped CeO2 quantum dots." Journal of Materials Science: Materials in Electronics 31, no. 15 (2020): 12661–77. http://dx.doi.org/10.1007/s10854-020-03816-7.

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41

Tao, Hou, Wu Shao-Quan, Bi Ai-Hua, Yang Fu-Bin, and Sun Wei-Li. "Spin-Polarized Transport through Parallel Double Quantum Dots Coupled to Ferromagnetic Leads." Chinese Physics Letters 25, no. 6 (2008): 2198–201. http://dx.doi.org/10.1088/0256-307x/25/6/075.

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42

Ai-Hua, Bi, Wu Shao-Quan, Hou Tao, and Sun Wei-Li. "Fano–Kondo Effect in a Triple Quantum Dots Coupled to Ferromagnetic Leads." Chinese Physics Letters 25, no. 8 (2008): 3028–31. http://dx.doi.org/10.1088/0256-307x/25/8/079.

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43

Fransson, J. "Angular conductance resonances of quantum dots non-collinearly coupled to ferromagnetic leads." Europhysics Letters (EPL) 70, no. 6 (2005): 796–802. http://dx.doi.org/10.1209/epl/i2005-10043-1.

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44

Wrześniewski, K., and I. Weymann. "Current Suppression in Transport Through Triple Quantum Dots Coupled to Ferromagnetic Leads." Acta Physica Polonica A 127, no. 2 (2015): 460–62. http://dx.doi.org/10.12693/aphyspola.127.460.

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45

Duan, Xiaoxiao, Shuming Ye, Jing Yang, et al. "High Curie Temperature Achieved in the Ferromagnetic MnxGe1−x/Si Quantum Dots Grown by Ion Beam Co-Sputtering." Nanomaterials 12, no. 4 (2022): 716. http://dx.doi.org/10.3390/nano12040716.

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Ferromagnetic semiconductors (FMSs) exhibit great potential in spintronic applications. It is believed that a revolution of microelectronic techniques can take off, once the challenges of FMSs in both the room-temperature stability of the ferromagnetic phase and the compatibility with Si-based technology are overcome. In this article, the MnxGe1−x/Si quantum dots (QDs) with the Curie temperature (TC) higher than the room temperature were grown by ion beam co-sputtering (IBCS). With the Mn doping level increasing, the ripening growth of MnGe QDs occurs due to self-assembly via the Stranski–Kras

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46

Najdi, M. A. "The Charge and Spin Thermoelectric Properties across Double Quantum Dots Serially Coupled to Ferromagnetic Leads: The Case of Parallel Magnetic Configuration." BASRA JOURNAL OF SCIENCE 40, no. 1 (2022): 107–27. http://dx.doi.org/10.29072/basjs.20220106.

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In this article, the charge and spin thermoelectric properties of double quantum dots system connected to ferromagnetic leads with collinear magnetic configurations will be studied in the linear response regime. Our results are calculated in a strong interdot coupling regime by taking into consideration all parameters affecting the system such as interaction between dots and their coupling to the leads, intradot Coulomb correlation energy and spin-polarization on the leads. It is found that in the parallel magnetic configuration, the thermoelectric efficiency can reach a large value around the

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47

Najdi, M. A., J. M. AL-Mukh, and H. A. Jassem. "Theoretical Investigation in Coherent Manipulation throughout the Calculation of the Local Density of States in FM-DQD-FM Device." Materials Science Forum 1039 (July 20, 2021): 451–69. http://dx.doi.org/10.4028/www.scientific.net/msf.1039.451.

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In this work, theoretical investigation in coherent manipulation throughout local density of states calculation for serially coupled double quantum dots embedded between ferromagnetic leads (FM-QD1-QD2-FM) by using the non-equilibrium Green's function approach. Since the local density of states are formulated incorporating the spin polarization and the type of spin configuration on the leads. Our model incorporates the inter-dot hopping, the intra-dot Coulomb correlation, the spin exchange energy and the coupling interactions between the quantum dots and leads. The results concerned to the par

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48

Nazar, Laith, and T. A. Salman. "Tunneling magnetoresistance calculation for double quantum dot connected in parallel shape to ferromagnetic Leads." Journal of Kufa-Physics 15, no. 01 (2023): 69–76. http://dx.doi.org/10.31257/2018/jkp/2023/v15.i01.11428.

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In this paper, a theoretical model for electron transport through symmetric system consisting of two baths interferometer with one single-level quantum dot in each of its arms was considered. In this model, the dots are attached to ferromagnetic leads with parallel and antiparallel magnetic configurations. Green's function technique in this model was used. Our focus is on the Transport characteristics of conductance (G) and tunnel magnetoresistance (TMR). A special attention to the influence of an applied magnetics flux on the characteristics of conductance and tunneling magnetoresistance was

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49

Sadowski, J., J. Kanski, M. Adell, et al. "Solid Phase Epitaxy of Ferromagnetic MnAs Layer and Quantum Dots on Annealed GaMnAs." Acta Physica Polonica A 108, no. 5 (2005): 851–58. http://dx.doi.org/10.12693/aphyspola.108.851.

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50

Yu, Hui, Ting-Dun Wen, J. Q. Liang, and Q. F. Sun. "Phonon-assisted Kondo effect in single-molecule quantum dots coupled to ferromagnetic leads." Physics Letters A 372, no. 46 (2008): 6944–51. http://dx.doi.org/10.1016/j.physleta.2008.10.006.

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