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magnetooptics of HgTe/CdTe Quantum Wells with Giant Rashba Splitting in Magnetic Fields up to 34 T

SEMICONDUCTORS 2018年第11期52卷 1386-1391页

作者： Bovkun, L. S. Maremyanin, K. V. Ikonnikov, A. V. Spirin, K. E. Aleshkin, V. Ya. Potemski, M. Piot, B. A. Orlita, M. Mikhailov, N. N. Dvoretskii, S. A. Gavrilenko, V. I. Russian Acad Sci Inst Phys Microstruct Nizhnii Novgorod 603950 Russia UPS CNRS Lab Natl Champs Magnet Intenses UJFINSA F-38042 Grenoble France Nizhnii Novgorod State Univ Nizhnii Novgorod 603950 Russia Moscow MV Lomonosov State Univ Moscow 119991 Russia Russian Acad Sci Rzhanov Inst Semicond Phys Siberiand Branch Novosibirsk 630090 Russia Tomsk State Univ Tomsk 634050 Russia Novosibirsk State Univ Novosibirsk 630090 Russia

The electron cyclotron resonance spectra in classical and quantizing magnetic fields in asymmetric heterostructures with HgCdTe/CdHgTe quantum wells with selective barrier doping are investigated. Self-consistent calculations of the energy spectra at B = 0 and Landau levels in the framework of the 8-band Kane model using the Hartree approximation are made. The strong (similar to 10%) splitting of the cyclotron resonance line observed in weak fields is attributed to the Rashba effect in samples with inverted and normal band structures. The evolution of absorption lines upon a variation in the magnetic field is investigated up to 34 T, when the magnetic quantization already dominates over Rashba splitting.

关键词： magnetooptics QUANTUM wells RASHBA effect MAGNETIC fields ELECTRON cyclotron resonance sources

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magnetooptics of Manganites with Collosal Magnetoresistance

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PHYSICS OF METALS AND METALLOGRAPHY 2018年第13期119卷 1280-1283页

作者： Sukhorukov, Yu. P. Nosov, A. P. Bessonova, V. A. Russian Acad Sci Ural Branch Mikheev Inst Met Phys Ekaterinburg 620108 Russia

The determination of trends in the emergence of magnetooptical properties and the influence of magnetic phase transitions on the optical properties of magnetic materials is a topical issue in various areas of physics and engineering. The present review is focused on the high-magnitude magnetooptical effects ofmagnetotransmission and magnetoreflection of unpolarized radiation in a wide spectral region discovered in manganites with colossal magnetoresistance (CMR). The physical mechanisms of these magnetooptical effects in manganites and the potential for their practical application are discussed. The questions requiring further study are formulated.

关键词： manganites magnetooptics magnetotransmission magnetoreflection

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Magnetism and magnetooptics features of Zn_1-xCo_xO_y thin films grown by pulsed laser deposition

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MATERIALS CHEMISTRY AND PHYSICS 2017年 198卷 291-296页

作者： Kuz'mina, A. S. Lotin, A. A. Novodvorsky, O. A. Perov, N. S. Gan'shina, E. A. Makarova, L. A. Semisalova, A. S. Shneider, A. G. Kuz'min, M. P. Kolesnikov, S. S. Irkutsk Natl Res Tech Univ Irkutsk 664074 Russia RAS Branch Fed Sci Ctr Crystallog & Photon ILIT MS Shatura 140700 Russia Lomonosov Moscow State Univ Moscow 119991 Russia

The results of a comprehensive study of structural, magnetic and magneto-optical properties of 10-262 nm thick Zn1-xCoxOy films (x = 0-0.3) grown on c-sapphire substrates by pulsed laser deposition (PLD) method are present. It is revealed that all of the synthesized Zn1-xCoxOy films possess a wurtzite structure with the following lattice parameters: a = 3.2495 angstrom, c = 5.2329-5.2485 angstrom. It is detected that ferromagnetic properties of Zn1-xCoxOy films at room temperature vary non-monotonically with the increase of Co concentration. The strongest ferromagnetic signal is observed in the Zn0.87Co0.13Oy film due to the largest number of metallic Co clusters formed in the sample. A further increase of dopant concentrations in the films leads to the oxidation of metallic Co and the development of the paramagnetic Co3O4 phase which result in the decrease of the ferromagnetic signal. It is determined that specific magnetic characteristics of Zn1-xCoxOy samples do not depend on the film thickness. Characteristics of transversal Kerr effect pertaining to cobalt concentration in Zn1-xCoxOy films as well as thickness of the samples are studied for the first time. The correlation between the amplitude of the magneto-optical signal and the magnetization value of the films is established. (C) 2017 Elsevier B.V. All rights reserved.

关键词： Zn1-xCoxOy thin films Pulsed laser deposition Magnetism magnetooptics Spintronics

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Femtosecond magnetooptics and the orbital model of the ultrafast magnetic dynamics

Femtosecond magnetooptics and the orbital model of the ultra...

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International Conference on Phase Transitions, Critical and Nonlinear Phenomena in Condensed Matter, PTCNPCM 2015

作者： Kurkin, Mikhail Ivanovich Orlova, Natalia Borisovna Institute of Metal Physics Ural Branch of Russian Academy of Sciences Ekaterinburg620041 Russia Novosibirsk State Technical University Novosibirsk630092 Russia

ISBN: (纸本)9783038356493

I. Introduction The critical analysis of the magnetization reversal processes and magnetooptics of ferromagnets was carried out. The condition of the formation of nonequilibrium orbital momenta l_(pf) after turning off the femtosecond laser pumping was found. The frequency range for processes involving l_(pf) was estimated as 10~6 Hz to 10~1 Hz. Such objects were not known in the magnetism before using the methods of femtosecond optics. The estimated frequency range covers all the processes related to femtosecond magnetism. Our qualitative analysis of these processes allows us to hope that their quantitative description does not require significant changes in the existing theories of magnetism.

关键词： magnetooptics femtosecond magnetooptics femtomagnetism magnetooptics frequency ranges Magnetism Femtosecond Inverse method Ferromagnetism

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magnetooptics of the luminescent transitions in Tb³⁺:Gd₃Ga₅O₁₂

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OPTICAL MATERIALS 2015年第Aug.期46卷 282-291页

作者： Valiev, Uygun V. Gruber, John B. Ivanov, Igor' A. Burdick, Gary W. Liang, Hongbin Zhou, Lei Fu, Dejun Pelenovich, Oleg V. Pelenovich, Vasiliy O. Lin, Zhou Natl Univ Uzbekistan Fac Phys Tashkent 100174 Uzbekistan San Jose State Univ Dept Phys San Jose CA 95192 USA Russian Acad Sci Shubnikov Inst Crystallog Moscow 119333 Russia Andrews Univ Dept Phys Berrien Springs MI 49104 USA Sun Yat Sen Univ Sch Chem & Chem Engn Guangzhou 510275 Guangdong Peoples R China Wuhan Univ Sch Phys & Technol Wuhan 430072 Peoples R China Tsinghua Univ Shenzhen Ctr Informat & Optomechatron Res Inst Shenzhen 518057 Peoples R China

The spectra of the luminescence and magnetic circular polarization of luminescence in terbium gadolinium gallium garnet Tb3+:Gd3Ga5O12 (Tb3+:GGG) were studied within the visible spectral range at temperatures T = 90 and 300 K in an external magnetic field of 0.45 T. The Zeeman effect in the luminescence "green" band associated with 4f -> 4f transition D-5(4) -> F-7(5) of Tb3+:GGG was also studied at T = 90K in an external field of 0.55 T. Measurement of the Zeeman effect in Tb3+:GGG carried out for some doublet lines of the luminescence band D-5(4) -> F-7(5) at T = 90 K shows that a magnetooptical effect of the intensity change of the emitted light is observed on these lines, in contrast to pure Zeeman splitting of the emission lines measured in the luminescence band D-5(4) -> F-7(6). For the systems we have studied, the maximal value of the magnetooptical effect of the intensity change of the luminescence line at low temperatures has been achieved in paramagnetic garnet Tb0.2Y2.8Al5O12 at comparatively low magnetic fields. (C) 2015 Elsevier B.V. All rights reserved.

关键词： Garnet magnetooptics Magnetic circular polarization of luminescence Zeeman splitting

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Direct Optical Probing of the Magnetic Properties of the Layered Antiferromagnet CrPS4

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ADVANCED OPTICAL MATERIALS 2025年第10期13卷

作者： Fas, Tomasz Wlazlo, Mateusz Birowska, Magdalena Rybak, Milosz Zinkiewicz, Malgorzata Oleschko, Leon Goryca, Mateusz Gondek, Lukasz Camargo, Bruno Szczytko, Jacek Budniak, Adam K. Amouyal, Yaron Lifshitz, Efrat Suffczynski, Jan Univ Warsaw Inst Expt Phys Fac Phys Pasteura 5 St PL-02093 Warsaw Poland Univ Warsaw Ctr New Technol Chem & Biol Syst Simulat Lab Banacha 2C PL-02097 Warsaw Poland Univ Warsaw Inst Theoret Phys Fac Phys 5 Pasteura St PL-02093 Warsaw Poland Wroclaw Univ Sci & Technol Fac Fundamental Problems Technol Dept Semicond Mat Engn Wybrzeze Stanislawa Wyspianskiego 27 PL-50370 Wroclaw Poland Univ Konstanz Dept Phys Univ Str 10 D-78457 Constance Germany AGH Univ Krakow Fac Phys & Appl Comp Sci 30 Mickiewicza St PL-30059 Krakow Poland Technion Israel Inst Technol Schulich Fac Chem IL-3200008 Hefa Israel Technion Israel Inst Technol Dept Mat Sci & Engn IL-3200003 Heifa Israel

The unusual magnetic properties of van der Waals-type antiferromagnetic semiconductors such as transition metal thiophosphates make them highly attractive for spintronics and optoelectronics. However, a link between the magnetic and optical properties of these materials, required for practical applications, has not yet been established. A combined experimental and theoretical study of magnetic, optical, and structural properties of CrPS4 samples is reported. It is found that the magnetic-field-dependent circular polarization degree of the photoluminescence is a direct measure of the net magnetization of CrPS4. Complementary Raman scattering measured as a function of magnetic field and temperature enables the determination of the magnetic susceptibility curve of the material. Experimental results are supported by density functional theory calculations that take as input the lattice parameters determined from temperature-dependent X-ray diffraction measurements. This allows the impact of spin ordering on the spectral position of Raman transitions in CrPS4 to be explained, as well as the anomalous temperature shifts of some of them. The presented method for all-optical determination of magnetic properties is highly promising for studies of spin ordering and magnetic phase transitions in single- or few-layer samples of magnetic layered materials, for which a poor signal-to-noise ratio precludes reliable neutron scattering or magnetometry measurements.

关键词： 2D materials anti-ferromagnetism magnetooptics photoluminescence Raman spectroscopy

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Magnetic Domain Wall Networked Films - Configurational Switching for Tunable Magnetization Dynamics by Perforated Thin Films

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ADVANCED MATERIALS TECHNOLOGIES 2024年第7期9卷

作者： Hollaender, Rasmus B. Mueller, Cai McCord, Jeffrey Univ Kiel Dept Mat Sci Nanoscale Magnet Mat Magnet Domains D-24143 Kiel Germany Univ Kiel Kiel Nano Surface & Interface Sci KiNSIS D-24118 Kiel Germany

Setting the magnetization and its properties in magnetic materials and films is of the utmost fundamental and technological importance for magnetic applications and devices. Magnetic permeabilities in a material are generally defined by the acting magnetic anisotropies together with an applied magnetic field. Here, deterministic switching of the effective dynamic magnetic properties is demonstrated by tunable networks of magnetic domain walls. By perforating magnetic films, a reversible switching between different magnetization states is achieved. Due to the resulting local effective dynamic fields for the changed domain configurations, different zero-field permeability spectra are attained for the same material structure. Using local configurational magnetic resonances confined by magnetic domain walls, deterministic switchable bimodal dynamic behavior is achieved. Dynamic magnetooptical Kerr microscopy with picosecond temporal resolution proves that the varying periodic magnetic domain configurations are responsible for the dynamic magnetic bistability. In particular, the field-free precessional magnetic response can be reproducibly switched between 1.3 and 2.3 GHz. The magnetization dynamics can be modified by small interventions in a repeatable manner beyond fixed material and structural properties. The described fundamental mechanism enables to design new energy efficient configurational microwave devices by switching between zero-field magnetic arrangements. Deterministic bi-modal switching of magnetic precession frequencies of magnetic thin films is achieved by manipulating networks of magnetic domain walls through magnetic film perforation. The spatial mechanism is elucidated using dynamic magneto-optical Kerr microscopy. The demonstrated method offers opportunities to design variable energy-efficient microwave devices by modifying magnetic arrangements beyond fixed properties. image

关键词： magnetic domains magnetic domain walls magnetic films magnetic imaging magnetization dynamics magnetooptics

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Transverse Magneto-Optical Kerr Effect Enhancement in Si-Ni Nanogratings by Mie and Surface Lattice Resonances

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PHYSICS OF METALS AND METALLOGRAPHY 2024年第2期125卷 118-123页

作者： Mamian, K. A. Frolov, A. Yu. Popov, V. V. Fedyanin, A. A. Lomonosov Moscow State Univ Fac Phys Moscow 119991 Russia

We demonstrate experimentally that a one-dimensional array of silicon nanowires periodically placed on a nickel substrate enhances the transverse magneto-optical Kerr effect (TMOKE) compared to a nickel film. The enhancement mechanism is associated with the excitation of two types of resonances: multipole Mie resonances in each nanowire and surface lattice resonances (SLRs) emerging from the periodic arrangement of the nanowires. The maximal TMOKE values reached up to 1.9 and 2.6% due to the excitation of SLR and a magnetic dipole resonance, respectively. When the SLR is excited, the spectral width of the TMOKE enhancement is narrower compared to the case of the magnetic dipole resonance.

关键词： magnetooptics nanophotonics Mie resonances transverse magneto-optical Kerr effect surface lattice resonance

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Effect of Co concentration on cation distribution and magnetic and magneto-optical properties of CoxZn1-xFe2O4 nanoparticles synthesized with citrate precursor method

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JOURNAL OF MATERIALS RESEARCH 2024年第21期39卷 3029-3044页

作者： Thakur, Atul Edelman, Irina Petrov, Dmitriy Ovchinnikov, Sergey Thakur, Preeti Zharkov, Sergey Knyazev, Yuri Sukhachev, Alexander Amity Univ Haryana Gurugram 122413 Haryana India Russian Acad Sci Kirensky Inst Phys Fed Res Ctr KSC Siberian Branch 50 Akademgorodok Krasnoyarsk 660036 Russia Siberian Fed Univ 79 Svobodny Ave Krasnoyarsk 660041 Russia

Magnetic properties of mixed spinel ferrites are determined, in great extent, by the magnetic cation distribution among tetrahedral and octahedral positions in a crystal. In the case of CoZn-ferrites, most researchers reported a predominant localization of the divalent cobalt ions in octahedral positions. Using the citrate precursor auto-combustion method, we successfully synthesized CoxZn1-xFe2O4 nanoparticles (x changed from 0.0 to 0.5) with an approximately evenly distribution of Co2+ ions between these interstitial positions. Fe3+ ions are localized preferably in octahedral positions. This type of 3d-ion distribution predetermined the combination of the large saturation magnetization and very low coercive field of the nanoparticles, which may be of importance for applications. MCD spectra of CoxZn1-xFe2O4 nanoparticles are studied here for the first time. Revealed intense MCD peak at 1.75 eV corresponds to the emission wavelength (710 nm) of some lasers, e.g., ALP-710 nm (NKT Photonics, Denmark) which may be of interest for photonic devices.

关键词： Nanostructure Magnetic properties Transmission electron microscopy (TEM) Mossbauer effect magnetooptics

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Effect of granule sizes on magneto-optical spectra of nanocomposites

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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 2024年 595卷

作者： Simdyanova, M. A. Yurasov, A. N. Yashin, M. M. Gan'shina, E. A. Gladyshev, I. V. Garshin, V. V. Pripechenkov, I. M. Granovsky, A. B. Vlasov, A. Yu. Lomonosov Moscow State Univ Fac Phys Moscow 119991 Russia Russian Technol Univ MIREA Moscow 119454 Russia Inst Theoret & Appl Electrodynam RAS Moscow 125412 Russia Samarkand State Univ Uzbekistan 140104 Uzbekistan Southern Fed Univ Inst Adv Technol & Piezotech Rostov Na Donu 344006 Russia

The magneto-optical transverse Kerr effect (TKE) spectroscopy allows non-contact investigation of nanostructures, giving valuable information about the microstructure of samples. In this paper, within the framework of effective medium approach we analyze the effect of granule size on the magneto-optical spectra of magnetic nanocomposites. We consider the influence of various microscopic parameters such as plasma frequency, relaxation time, the coefficient of the anomalous Hall effect inside the granule and on its surface on the amplitude and profile of the TKE spectrum. Three main mechanisms are considered: the quasi-classical size effect, spin-orbit interaction enhancement at the granule surface and change of the percolation threshold.

关键词： magnetooptics Kerr effect Nanocomposites Size effect

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