Modelling the magnetorefractive effect in giant magnetoresistive granular and layered materials

Mennicke, R.T.; Bozec, D.; Kravets, A. F.; Vopsaroiu, M.; Matthew, J.A.D.; Thompson, S.M.

doi:10.1016/j.jmmm.2005.10.233

Cited by 34 publications

(17 citation statements)

References 24 publications

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“…Thus, the competition between the intraband and interband contributions leads to a change of sign of MRE as a function of wavelength. This experimental fact contradicts to the predictions of the Drude model [6][7][8][9][10], where the intraband contribution into the conductivity is considered only. Due to such contribution the MRE curve always keeps the same sign.…”

Section: Experimental Results and Their Discussioncontrasting

confidence: 78%

“…The experiment was performed by direct recording of the changes in the reflected intensity as a function of applied magnetic field at λ ∼ 20.7 μm and λ ∼ 13.5 μm for CoFe/Cu and CoFe/Al 2 O 3 multilayer films, respectively (Figure 2(b)). It has been previously shown [9,11] that the correlation between the GMR and MRE should be most evident at extreme wavelengths where the MRE reproduces the maximum values. These dependences (Figures 2(a) and 2(b)) clearly show the possibility to perform noncontact magnetotransport measurements on the samples with giant and tunneling magnetoresistance by measuring the variation of their reflected intensity in magnetic field at fixed wavelength, λ.…”

Section: Experimental Results and Their Discussionmentioning

confidence: 91%

“…Moreover, the MRE is sufficiently larger in the IR region than the corresponding MO values [6][7][8]. Infrared transmission or reflection spectroscopy can provide a direct tool for probing the spin-dependent conductivity in GMR and TMR samples [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Correlation between the Magnetoresistance, IR Magnetoreflectance, and Spin-Dependent Characteristics of Multilayer Magnetic Films

Kravets

2012

Physics Research International

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We present the experimental results on magnetorefractive effect (MRE) in ferromagnetic metal-metal and metal-insulator multilayer films of different composition and different type of magnetoresistive effects. The shape and magnitude of the MRE dependences are found to be very sensitive to the spin-dependent scattering parameters and the effective polarization of the electron density of state around the Fermi level. A study of an MRE in multilayered films is shown to be sufficient for direct extracting of the spin-dependent relaxation times of electron (for GMR-like samples) and energy dependence of the tunnel spin-polarization density of states near the Fermi level for layered TMR films. It is proposed to use the magnetorefractive effect as a noncontact probe of magnetoresistive effects in thin magnetic films through investigations of the field-dependent reflection behaviors of multilayered films in the IR region.

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Section: Experimental Results and Their Discussioncontrasting

confidence: 78%

Section: Experimental Results and Their Discussionmentioning

confidence: 91%

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Correlation between the Magnetoresistance, IR Magnetoreflectance, and Spin-Dependent Characteristics of Multilayer Magnetic Films

Kravets

2012

Physics Research International

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“…Here, we assume for simplicity that the medium is isotropic, so that the conductivity σ(ω) and the dielectric complex function ε(ω) are scalars. We have defined the complex dielectric function and the real part of optical conductivity as given in [21][22][23][24].…”

Section: Samples Preparation and Experimental Methodsmentioning

confidence: 99%

Ellipsometry and optical spectroscopy of low-dimensional family TMDs

Kravets¹

2017

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Here, we report a comprehensive study of fundamental optical properties of two-dimensional materials. These properties have been ascertained using spectroscopic ellipsometry, optical spectroscopy of Raman scattering, and photoluminescence. We have focused on optical properties of the chemically exfoliated layered TMDs: MoS 2 , MoSe 2 , WS 2 , and WSe 2 . The complex refractive index and optical conductivity within the region 1 to 4.5 eV were extracted, which lead to identification of many unique interband transitions at high symmetry points in the electron band structure. The positions of the so-called A and B excitons in monolayers are found to shift upwards in energy as compared with those of the bulk form and have smaller separation because of the decreased interactions between the layers. For monolayer TMDs, the valence-band spin-orbit splitting at the K point was estimated from the energy difference between the A and B exciton peaks. Our findings of the spin-orbit coupling of ∼0.16, ∼0.26, ∼0.37, and ∼0.55 eV in monolayers MoS 2 , MoSe 2 , WS 2 , and WSe 2 , respectively. All these findings not only extend our understanding the novel electronic structures of mono-and few-layers TMDs but also provide foundation for future technological applications of optoelectronic and spintronic device components.

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“…Оптический отклик наиболее ярко проявился в области взаимодей-ствия света с носителями заряда при частотах ω ≤ ω p (ω p -плазменная частота), т. е. для металлов и магнит-ных полупроводников -в инфракрасной (ИК) области спектра (например, [5][6][7] и ссылки в них). Появление экспериментальных результатов позволило разработать теорию магниторефрактивного эффекта (МРЭ), преиму-щественно в области ωτ < 1 (τ -время релаксации), для металлов [5,9], гранулированных и нанокомпозит-ных металлических структур [10,11], тонкопленочных наноструктур с ГМС [12] и манганитов с КМС [13]. Важным фактом является то, что согласно экспери-ментальным данным и теоретическим оценкам МРЭ на * Доклад на XX Международном симпозиуме " Нанофизика и нано-электроника", Н. Новгород, 13−16 марта 2017 г.…”

Section: Introductionunclassified

Особенности магниторефрактивного эффекта в многослойной металлической наноструктуре [CoFe/Cu]-=SUB=-n-=/SUB=--=SUP=-*-=/SUP=-

Юрасов¹,

Telegin²,

Bannikova³

et al. 2018

Физика Твердого Тела

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обладающих эффектом гигантского магнитосопротивления при комнатных температурах. Показано, что магниторефрактивный эффект в таких структурах достигает 1.5% в магнитном поле 3.5 kOe в широкой ИК-области спектра и может менять знак как на пропускании, так и на отражении света. Рассчитаны величины коэффициентов рефракции и экстинкции для наноструктур в магнитном поле, которые хорошо согласуются с полученными экспериментальными данными. Полученные формулы можно использовать для оценки магниторефрактивного эффекта в металлических многослойных структурах.Работа выполнена в рамках государственного задания ФАНО России (тема " Спин" № 01201463330), при частичной поддержке программы УрО РАН № 18-10-2-4 и гранта Министерства образования и науки РФ № 14.Z50.31.0025 и гранта Президента РФ для ведущих научных школ НШ-8003.2016.2.

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Modelling the magnetorefractive effect in giant magnetoresistive granular and layered materials

Cited by 34 publications

References 24 publications

Correlation between the Magnetoresistance, IR Magnetoreflectance, and Spin-Dependent Characteristics of Multilayer Magnetic Films

Correlation between the Magnetoresistance, IR Magnetoreflectance, and Spin-Dependent Characteristics of Multilayer Magnetic Films

Ellipsometry and optical spectroscopy of low-dimensional family TMDs

Особенности магниторефрактивного эффекта в многослойной металлической наноструктуре [CoFe/Cu]-=SUB=-n-=/SUB=--=SUP=-*-=/SUP=-

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