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Journal articles on the topic 'Infrared magneto-spectroscopy'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

SADOWSKI, M. L., G. MARTINEZ, M. POTEMSKI, C. BERGER, and W. A. DE HEER. "MAGNETO-SPECTROSCOPY OF EPITAXIAL GRAPHENE." International Journal of Modern Physics B 21, no. 08n09 (April 10, 2007): 1145–54. http://dx.doi.org/10.1142/s0217979207042586.

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We present a far infrared investigation of the optical transitions in epitaxial graphene subjected to a perpendicular magnetic field. Cyclotron-resonance-like transitions between adjacent electron Landau levels are observed, as well as interband transitions. The results are discussed in terms of existing theoretical models of Dirac fermions in graphene, and the relevant optical selection rules.

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2

Yan, Hugen, Zhiqiang Li, Xuesong Li, Wenjuan Zhu, Phaedon Avouris, and Fengnian Xia. "Infrared Spectroscopy of Tunable Dirac Terahertz Magneto-Plasmons in Graphene." Nano Letters 12, no. 7 (June 13, 2012): 3766–71. http://dx.doi.org/10.1021/nl3016335.

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3

Krizman, G., F. Carosella, J. Bermejo-Ortiz, A. Philippe, J. B. Rodriguez, J. P. Perez, P. Christol, L. A. de Vaulchier, and Y. Guldner. "Magneto-spectroscopy investigation of InAs/InAsSb superlattices for midwave infrared detection." Journal of Applied Physics 130, no. 5 (August 7, 2021): 055704. http://dx.doi.org/10.1063/5.0054320.

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4

Jensen, M. R. F., S. A. Feiven, T. J. Parker, and R. E. Camley. "Far-infrared magneto-spectroscopy of bulk and surface magnetic excitations in FeF2." Journal of Magnetism and Magnetic Materials 177-181 (January 1998): 835–36. http://dx.doi.org/10.1016/s0304-8853(97)00759-2.

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5

Orlita, M., C. Faugeras, A. L. Barra, G. Martinez, M. Potemski, D. M. Basko, M. S. Zholudev, et al. "Infrared magneto-spectroscopy of two-dimensional and three-dimensional massless fermions: A comparison." Journal of Applied Physics 117, no. 11 (March 21, 2015): 112803. http://dx.doi.org/10.1063/1.4913828.

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6

Nisida, Y., and K. Muro. "Far-Infrared Magneto-Spectroscopy of Shallow Impurities and Excitons in Germanium by Using Lasers." Progress of Theoretical Physics Supplement 57 (May 14, 2013): 77–86. http://dx.doi.org/10.1143/ptp.57.77.

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7

Armelles, Gaspar, Luca Bergamini, Alfonso Cebollada, Nerea Zabala, and Javier Aizpurua. "A novel vibrational spectroscopy using spintronic–plasmonic antennas: Magneto-refractive surface-enhanced infrared absorption." Journal of Applied Physics 129, no. 7 (February 21, 2021): 073103. http://dx.doi.org/10.1063/5.0036385.

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8

Brown, D. E., T. Dumelow, M. R. F. Jensen, and T. J. Parker. "A high-resolution Fourier transform spectrometer for far infrared magneto-optic spectroscopy of magnetic materials." Infrared Physics & Technology 40, no. 3 (June 1999): 219–30. http://dx.doi.org/10.1016/s1350-4495(99)00013-4.

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9

Kimura, Shin-ichi, Hideaki Kitazawa, Giyu Kido, and Takashi Suzuki. "Electronic Structure in the Magnetically Ordered States of CeSb Studied by Infrared Magneto-Optical Spectroscopy." Journal of the Physical Society of Japan 69, no. 3 (March 15, 2000): 647–50. http://dx.doi.org/10.1143/jpsj.69.647.

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10

Jiang, Yuxuan, Zhengguang Lu, Jamey Gigliotti, Avinash Rustagi, Li Chen, Claire Berger, Walt de Heer, Christopher J. Stanton, Dmitry Smirnov, and Zhigang Jiang. "Valley and Zeeman Splittings in Multilayer Epitaxial Graphene Revealed by Circular Polarization Resolved Magneto-infrared Spectroscopy." Nano Letters 19, no. 10 (August 30, 2019): 7043–49. http://dx.doi.org/10.1021/acs.nanolett.9b02505.

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11

Mucha-Kruczyński, M., D. S. L. Abergel, E. McCann, and V. I. Fal’ko. "On spectral properties of bilayer graphene: the effect of an SiC substrate and infrared magneto-spectroscopy." Journal of Physics: Condensed Matter 21, no. 34 (July 27, 2009): 344206. http://dx.doi.org/10.1088/0953-8984/21/34/344206.

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12

Jiang, Yuxuan, Mahmoud M. Asmar, Xingyue Han, Mykhaylo Ozerov, Dmitry Smirnov, Maryam Salehi, Seongshik Oh, Zhigang Jiang, Wang-Kong Tse, and Liang Wu. "Electron–Hole Asymmetry of Surface States in Topological Insulator Sb2Te3 Thin Films Revealed by Magneto-Infrared Spectroscopy." Nano Letters 20, no. 6 (May 13, 2020): 4588–93. http://dx.doi.org/10.1021/acs.nanolett.0c01447.

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13

Tkachenko, Volodymyr, Giancarlo Abbate, and Antigone Marino. "Magneto-optic ellipsometry characterization of Co and SmCo thin films." Photonics Letters of Poland 9, no. 1 (March 31, 2017): 29. http://dx.doi.org/10.4302/plp.v9i1.711.

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Magneto-optic ellipsometry in the longitudinal Kerr configuration was performed to determine the complex permittivity tensor of the Co and SmCo thin films within the spectral range from 400nm to 1000nm. The Co film was a middle layer in a Au/Co/Au trilayer structure. Magneto-optical response was analyzed in terms of Mueller matrix elements. Reduced magneto-optical response of the Co layer is explained by influence of the gold top layer of the trilayer structure. Full Text: PDF ReferencesM. Mansuripur, The Physical Principles of Magneto Optical Recording (Cambridge, Cambridge University Press, 1995). CrossRef B. Sepúlveda, A. Calle, L.M. Lechuga, G. Armelles, "Highly sensitive detection of biomolecules with the magneto-optic surface-plasmon-resonance sensor", Opt. Lett. 31, 1085 (2006). CrossRef D. Regatos et al., "Au/Fe/Au multilayer transducers for magneto-optic surface plasmon resonance sensing", J.Appl.Phys. 108, 054502 (2010). CrossRef D. Regatos, B. Sepúlveda, D. Farina, L.G. Carrascosa, L.M. Lechuga, "Suitable combination of noble/ferromagnetic metal multilayers for enhanced magneto-plasmonic biosensing", Opt. Express 19, 8336 (2011). CrossRef G. Armelle et al., "Localized surface plasmon resonance effects on the magneto-optical activity of continuous Au/Co/Au trilayers", Opt. Express 16, 16104 (2008). CrossRef C. Hermann, "Surface-enhanced magneto-optics in metallic multilayer films", Phys. Rev. B 64, 235422 (2001). CrossRef J. B. González-Díaz et al., "Surface-magnetoplasmon nonreciprocity effects in noble-metal/ferromagnetic heterostructures", Phys. Rev. B 76, 153402 (2007). CrossRef V. V. Temnov et al., "Active magneto-plasmonics in hybrid metal?ferromagnet structures", Nat. Photonics 4(2), 107 (2010). CrossRef A. Berger, M. R. Pufall, "Generalized magneto-optical ellipsometry", Appl. Phys. Lett. 71, 965 (1997). CrossRef R. Rauer, G. Neuber, J. Kunze, J. Backstrom, M. Rubhausen, "Temperature-dependent spectral generalized magneto-optical ellipsometry for ferromagnetic compounds", Rev. Sci. Instrum. 76, 023910 (2005). CrossRef K. Mok, N. Du, H. Schmidt, "Vector-magneto-optical generalized ellipsometry", Rev. Sci. Instrum. 82, 033112 (2011). CrossRef W.A. McGahan, J.A. Woollam, "Magnetooptics of multilayer systems", Appl. Phys. Commun. 9, 1 (1989).D.P. Kumah et al., "Optimizing the planar structure of (1 1 1) Au/Co/Au trilayers", J. Phys. D: Appl. Phys. 40, 2699 (2007). CrossRef L. Alocca et al., "Laser deposition of SmCo thin film and coating on different substrates", Phys. Scr. 78, 058114 (2008). CrossRef H.G. Tompkins, E.A. Irene, Handbook of Ellipsometry (Norwich, William Andrew, 2005). CrossRef G. Abbate et al., "Optical characterization of liquid crystals by combined ellipsometry and half-leaky-guided-mode spectroscopy in the visible-near infrared range", J. Appl. Phys. 101, 073105 (2007). CrossRef Y.V. Knyazev, M.N. Noskov, "OPTICAL PROPERTIES OF GADOLINIUM, SAMARIUM, AND DYSPROSIUM IN THE SPECTRAL RANGE 1.13 TO 3.96 eV.", Phys. Met. Metallogr. 30, 230 (1970).

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14

Burba, Christopher M., and Hai-Chou Chang. "The Nature of Cation–Anion Interactions in Magnetic Ionic Liquids as Revealed Using High-Pressure Fourier Transform Infrared (FT-IR) Spectroscopy." Applied Spectroscopy 73, no. 5 (January 10, 2019): 511–19. http://dx.doi.org/10.1177/0003702818805499.

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Magnetic ionic liquids are a group of magneto-responsive compounds that typically possess high ionic conductivities and low vapor pressures. In spite of the general interest in these materials, a number of questions concerning the fundamental interactions among the ions remain unanswered. We used vibrational spectroscopy to gain insight into the nature of these interactions. Intramolecular vibrational modes of the ions are quite sensitive to their local potential energy environments, which are ultimately defined by cation–anion coordination schemes present among the ions. Ambient pressure Fourier transform infrared (FT-IR) spectroscopy indicates comparable interaction motifs for 1-ethyl-3-methylimidazolium tetrachloroferrate(III), [emim]FeCl4, and 1-ethyl-3-methylimidazolium tetrabromoferrate(III), [emim]FeBr4, magnetic ionic liquids. However, the vibrational modes of [emim]FeCl4 generally occur at slightly higher frequencies than those of [emim]FeBr4. These differences reflect different interaction strengths between the [emim]+ cations and [Formula: see text] or [Formula: see text] anions. This conclusion is supported by gas-phase ab initio calculations of single [emim]FeCl4 and [emim]FeBr4 ion pairs that show longer C–H···Br–Fe interaction lengths compared to C–H···Cl–Fe. Although the IR spectra of [emim]FeCl4 and [emim]FeBr4 are comparable at ambient pressure, a different series of spectroscopic changes transpire when pressure is applied to these compounds. This suggests [emim]+ cations experience different types of interaction with the anions under high-pressure conditions. The pressure-dependent FT-IR spectra highlights the critical role ligands attached to the tetrahalogenoferrate(III) anions play in modulating cation–anion interactions in magnetic ionic liquids.

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15

Zoufalý, Pavel, Erik Čižmár, Juraj Kuchár, and Radovan Herchel. "The Structural and Magnetic Properties of FeII and CoII Complexes with 2-(furan-2-yl)-5-pyridin-2-yl-1,3,4-oxadiazole." Molecules 25, no. 2 (January 9, 2020): 277. http://dx.doi.org/10.3390/molecules25020277.

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Two novel coordination compounds containing heterocyclic bidentate N,N-donor ligand 2-(furan-2-yl)-5-(pyridin-2-yl)-1,3,4-oxadiazole (fpo) were synthesized. A general formula for compounds originating from perchlorates of iron, cobalt, and fpo can be written as: [M(fpo)2(H2O)2](ClO4)2 (M = Fe(II) for (1) Co(II) for (2)). The characterization of compounds was performed by general physico-chemical methods—elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) in case of organics, and single crystal X-ray diffraction (sXRD). Moreover, magneto-chemical properties were studied employing measurements in static field (DC) for 1 and X-band EPR (Electron paramagnetic resonance), direct current (DC), and alternating current (AC) magnetic measurements in case of 2. The analysis of DC magnetic properties revealed a high spin arrangement in 1, significant rhombicity for both complexes, and large magnetic anisotropy in 2 (D = −21.2 cm−1). Moreover, 2 showed field-induced slow relaxation of the magnetization (Ueff = 65.3 K). EPR spectroscopy and ab initio calculations (CASSCF/NEVPT2) confirmed the presence of easy axis anisotropy and the importance of the second coordination sphere.

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16

Xu, Kun, Luo Zhang, Andy Godfrey, Dongsheng Song, Wenlong Si, Yawen Zhao, Yi Liu, et al. "Atomic-scale insights into quantum-order parameters in bismuth-doped iron garnet." Proceedings of the National Academy of Sciences 118, no. 20 (May 11, 2021): e2101106118. http://dx.doi.org/10.1073/pnas.2101106118.

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Bismuth and rare earth elements have been identified as effective substituent elements in the iron garnet structure, allowing an enhancement in magneto-optical response by several orders of magnitude in the visible and near-infrared region. Various mechanisms have been proposed to account for such enhancement, but testing of these ideas is hampered by a lack of suitable experimental data, where information is required not only regarding the lattice sites where substituent atoms are located but also how these atoms affect various order parameters. Here, we show for a Bi-substituted lutetium iron garnet how a suite of advanced electron microscopy techniques, combined with theoretical calculations, can be used to determine the interactions between a range of quantum-order parameters, including lattice, charge, spin, orbital, and crystal field splitting energy. In particular, we determine how the Bi distribution results in lattice distortions that are coupled with changes in electronic structure at certain lattice sites. These results reveal that these lattice distortions result in a decrease in the crystal-field splitting energies at Fe sites and in a lifted orbital degeneracy at octahedral sites, while the antiferromagnetic spin order remains preserved, thereby contributing to enhanced magneto-optical response in bismuth-substituted iron garnet. The combination of subangstrom imaging techniques and atomic-scale spectroscopy opens up possibilities for revealing insights into hidden coupling effects between multiple quantum-order parameters, thereby further guiding research and development for a wide range of complex functional materials.

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17

Nishi, T., S. Kimura, T. Takahashi, T. Ito, H. J. Im, Y. S. Kwon, K. Miyagawa, H. Taniguchi, A. Kawamoto, and K. Kanoda. "The origin of the phase separation in partially deuterated κ-(ET)2Cu[N(CN)2]Br studied by infrared magneto-optical imaging spectroscopy." Solid State Communications 134, no. 3 (April 2005): 189–93. http://dx.doi.org/10.1016/j.ssc.2005.01.026.

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18

Samourgkanidis, Georgios, Pavlos Nikolaou, Andreas Gkovosdis-Louvaris, Elias Sakellis, Ioanna Maria Blana, and Emmanuel Topoglidis. "Hemin-Modified SnO2/Metglas Electrodes for the Simultaneous Electrochemical and Magnetoelastic Sensing of H2O2." Coatings 8, no. 8 (August 16, 2018): 284. http://dx.doi.org/10.3390/coatings8080284.

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In this work, we present a simple and efficient method for the preparation of hemin-modified SnO2 films on Metglas ribbon substrates for the development of a sensitive magneto-electrochemical sensor for the determination of H2O2. The SnO2 films were prepared at low temperatures, using a simple hydrothermal method, compatible with the Metglas surface. The SnO2 film layer was fully characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), photoluminescence (PL) and Fourier Transform-Infrared spectroscopy (FT-IR). The properties of the films enable a high hemin loading to be achieved in a stable and functional way. The Hemin/SnO2-Metglas system was simultaneously used as a working electrode (WE) for cyclic voltammetry (CV) measurements and as a magnetoelastic sensor excited by external coils, which drive it to resonance and interrogate it. The CV scans reveal direct reduction and oxidation of the immobilized hemin, as well as good electrocatalytic response for the reduction of H2O2. In addition, the magnetoelastic resonance (MR) technique allows the detection of any mass change during the electroreduction of H2O2 by the immobilized hemin on the Metglas surface. The experimental results revealed a mass increase on the sensor during the redox reaction, which was calculated to be 767 ng/μM. This behavior was not detected during the control experiment, where only the NaH2PO4 solution was present. The following results also showed a sensitive electrochemical sensor response linearly proportional to the concentration of H2O2 in the range 1 × 10−6–72 × 10−6 M, with a correlation coefficient of 0.987 and detection limit of 1.6 × 10−7 M. Moreover, the Hemin/SnO2-Metglas displayed a rapid response (30 s) to H2O2 and exhibits good stability, reproducibility and selectivity.

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19

Kaur, Talwinder, Sachin Kumar, Jyoti Sharma, and A. K. Srivastava. "Radiation losses in the microwave Ku band in magneto-electric nanocomposites." Beilstein Journal of Nanotechnology 6 (August 7, 2015): 1700–1707. http://dx.doi.org/10.3762/bjnano.6.173.

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A study on radiation losses in conducting polymer nanocomposites, namely La–Co-substituted barium hexaferrite and polyaniline, is presented. The study was performed by means of a vector network analyser, X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, electron spin resonance spectroscopy and a vibrating sample magnetometer. It is found that the maximum loss occurs at 17.9 GHz (−23.10 dB, 99% loss) which is due to the composition of a conducting polymer and a suitable magnetic material. A significant role of polyaniline has been observed in ESR. The influence of the magnetic properties on the radiation losses is explained. Further studies revealed that the prepared material is a nanocomposite. FTIR spectra show the presence of expected chemical structures such as C–H bonds in a ring system at 1512 cm−1.

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20

POTEMSKI, M. "LANDAU LEVEL SPECTROSCOPY OF DIRAC-LIKE FERMIONS IN MULTILAYER GRAPHENE." International Journal of Modern Physics B 23, no. 12n13 (May 20, 2009): 2665–66. http://dx.doi.org/10.1142/s0217979209062141.

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The results of spectroscopic (magneto-transmission and Raman scattering) studies1–8 of multilayers of carbon which are thermally decomposed from carbon-terminated surface of silicon carbide, and of thin layers of highly oriented pyrolytic and natural graphite were presented. Those carbon multilayers on silicon carbide which are not directly affected by the SiC / C interface and which in consequence are nearly charge neutral show the magneto-optical properties identical with the properties characteristic of a single graphite sheet, graphene. Inter Landau level transitions in this multilayer graphene have been studied in a wide spectral range from far-infrared to almost visible region. The dispersion relations of electronic states are found to reflect the form of the Dirac cone with almost perfect electron-hole symmetry and only weak deviations from linearity at high energies. Cyclotron resonance transition in multilayer graphene can be observed in magnetic fields down to 40 mT, and its width is practically independent on temperature up to 300 K. Such parameters as carrier mobility and minimal conductivity as well as the possibility to probe the immediate vicinity of the Dirac point were evaluated and discussed in detail. For comparison, the magneto-optical properties of thin layers of bulk graphite were also reported. The Dirac like electronic dispersion relations are also found in these systems, but only in the vicinity of the particular (H) point of the Brillouin zone. In general, the measured spectra are, however, more complex and reflect the three-dimensional character of graphene layers with Bernal stacking. Note from Publisher: This article contains the abstract only.

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21

Cao, Yuan, Yue Cheng, and Gang Zhao. "Near-Infrared Light-, Magneto-, and pH-Responsive GO–Fe3O4/Poly(N-isopropylacrylamide)/alginate Nanocomposite Hydrogel Microcapsules for Controlled Drug Release." Langmuir 37, no. 18 (April 30, 2021): 5522–30. http://dx.doi.org/10.1021/acs.langmuir.1c00207.

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22

T. S., Anilkumar, Yu-Jen Lu, and Jyh-Ping Chen. "Optimization of the Preparation of Magnetic Liposomes for the Combined Use of Magnetic Hyperthermia and Photothermia in Dual Magneto-Photothermal Cancer Therapy." International Journal of Molecular Sciences 21, no. 15 (July 22, 2020): 5187. http://dx.doi.org/10.3390/ijms21155187.

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In this work, we aimed to develop liposomal nanocomposites containing citric-acid-coated iron oxide magnetic nanoparticles (CMNPs) for dual magneto-photothermal cancer therapy induced by alternating magnetic field (AMF) and near-infrared (NIR) lasers. Toward this end, CMNPs were encapsulated in cationic liposomes to form nano-sized magnetic liposomes (MLs) for simultaneous magnetic hyperthermia (MH) in the presence of AMF and photothermia (PT) induced by NIR laser exposure, which amplified the heating efficiency for dual-mode cancer cell killing and tumor therapy. Since the heating capability is directly related to the amount of entrapped CMNPs in MLs, while the liposome size is important to allow internalization by cancer cells, response surface methodology was utilized to optimize the preparation of MLs by simultaneously maximizing the encapsulation efficiency (EE) of CMNPs in MLs and minimizing the size of MLs. The experimental design was performed based on the central composite rotatable design. The accuracy of the model was verified from the validation experiments, providing a simple and effective method for fabricating the best MLs, with an EE of 87% and liposome size of 121 nm. The CMNPs and the optimized MLs were fully characterized from chemical and physical perspectives. In the presence of dual AMF and NIR laser treatment, a suspension of MLs demonstrated amplified heat generation from dual hyperthermia (MH)–photothermia (PT) in comparison with single MH or PT. In vitro cell culture experiments confirmed the efficient cellular uptake of the MLs from confocal laser scanning microscopy due to passive accumulation in human glioblastoma U87 cells originated from the cationic nature of MLs. The inducible thermal effects mediated by MLs after endocytosis also led to enhanced cytotoxicity and cumulative cell death of cancer cells in the presence of AMF–NIR lasers. This functional nanocomposite will be a potential candidate for bimodal MH–PT dual magneto-photothermal cancer therapy.

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23

Weller, D., and W. Rcim. "Magneto-Optical Spectroscopy of RE/TM Alloys and TM/CO Multilayers." MRS Proceedings 232 (1991). http://dx.doi.org/10.1557/proc-232-71.

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ABSTRACTThis paper reviews on magneto-optical spectroscopy of alloys, metallic multilayers and interference enhancement structures for magneto-optic (MO) recording. Mainly rare earth transition metal (RE-TM) alloys and Co/transition metal (Co/X) multilayers will be discussed. The read out performance in MO write/read tests is given by tile reflectivity and Kerr rotation strongly depends on the wavelength. While the magneto-optical transitions in the near infrared (IR:≈820nm) are dominated by tile 3d magnetic transition metals Fe and Co, the properties in the ultraviolet (UV: <400nm) can be dominated by either rare earths like Nd or Pr in RE-TM alloys or by exchange polarized Pt or Pd in Co/X multilayers and their respective alloys.In an attempt to correlate the magneto-optic Kerr effect to electronic properties we have systematically investigated alloys and multilayers with x-ray photoemission (XPS) and polar magneto-optical Kerr spectroscopy (0.5–5.3eV range). It is found that electronic 4f levels in Nd or Pr contribute to the Kerr elffct via Γ→, d transitions in the order of 0.3°. Exchange polarized Pd and Pt in Co/X multilayers give rise to a room temperature Kerr rotation in the same order of magnitude via excitations of the 4d and 5d bands, respectively. These effects clearly depend on film compositions and thickness ratios.,

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24

Lewis, R. A., and Y. J. Wang. "Magneto-optical far-infrared absorption spectroscopy of the hole states of indium phosphide." Physical Review B 71, no. 11 (March 29, 2005). http://dx.doi.org/10.1103/physrevb.71.115211.

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25

Jiang, Y., S. Thapa, G. D. Sanders, C. J. Stanton, Q. Zhang, J. Kono, W. K. Lou, et al. "Probing the semiconductor to semimetal transition in InAs/GaSb double quantum wells by magneto-infrared spectroscopy." Physical Review B 95, no. 4 (January 11, 2017). http://dx.doi.org/10.1103/physrevb.95.045116.

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26

Okamura, Y., S. Minami, Y. Kato, Y. Fujishiro, Y. Kaneko, J. Ikeda, J. Muramoto, et al. "Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2." Nature Communications 11, no. 1 (September 15, 2020). http://dx.doi.org/10.1038/s41467-020-18470-0.

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Abstract The Weyl semimetal (WSM), which hosts pairs of Weyl points and accompanying Berry curvature in momentum space near Fermi level, is expected to exhibit novel electromagnetic phenomena. Although the large optical/electronic responses such as nonlinear optical effects and intrinsic anomalous Hall effect (AHE) have recently been demonstrated indeed, the conclusive evidence for their topological origins has remained elusive. Here, we report the gigantic magneto-optical (MO) response arising from the topological electronic structure with intense Berry curvature in magnetic WSM Co3Sn2S2. The low-energy MO spectroscopy and the first-principles calculation reveal that the interband transitions on the nodal rings connected to the Weyl points show the resonance of the optical Hall conductivity and give rise to the giant intrinsic AHE in dc limit. The terahertz Faraday and infrared Kerr rotations are found to be remarkably enhanced by these resonances with topological electronic structures, demonstrating the novel low-energy optical response inherent to the magnetic WSM.

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27

Sung, Sang-Yeob, Xiaoyuan Qi, John Reinke, Samir K. Mondal, Sun Sook Lee, and Bethanie J. H. Stadler. "Fabrication of Integrated Magneto-Optic Isolator." MRS Proceedings 834 (2004). http://dx.doi.org/10.1557/proc-834-j4.2.

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ABSTRACTIn optical applications, especially in optical communications, protecting light sources from harmful reflected energy is very important. With magneto-optic isolators, these light sources can be protected to extend their lifetimes and performance by blocking back-reflected light. The active element in these optical isolators is a magneto-optical garnet. However, garnet is difficult to integrate with semiconductors due to the high thermal budget usually required to obtain the garnet crystal structure. For example, current isolator garnets cannot be integrated monolithically into a photonic integrated circuit due to the growth process, liquid phase epitaxy, which requires growth temperatures of >900 °C and also garnet substrates. In this work, magneto-optical garnets were grown monolithically by low-temperature reactive RF sputtering, followed by an ultra-short (<15 sec) anneal. The refractive indices of the resulting garnets were measured using Fourier transform infrared (FTIR) spectroscopy. Various rib waveguides were fabricated by both wet etching and reactive ion etching (RIE). The width of the waveguides varied from 2 to 12 μm and the heights were varied from 0.5 to 1.0 μm. Sm-Co thin films were used for integrated biasing magnets. They were deposited on top of claddings of both magnesium oxide and yttrium oxide, all using the same sputtering system that was used to deposit the garnet films. These magnetic films had high enough remanent fields to saturate the garnet waveguides, and they had coercivities of 700 Oe. The Faraday rotations and waveguide losses of the subsequent isolators were measured to be 10 degrees and 0.1 dB/μm at 632 nm, respectively. Although this prototype is promising, optimization of the device designs is ongoing. In summary, this work succeeded in providing the first comprehensive report on etching YIG by RIE, in developing all of the steps required for integrating isolators on non-garnet substrates, and in proving the feasibility of these isolators.

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