Magneto-optical properties of metallic ferromagnetic materials

Buschow, K.H.J.; Engen, P.G. van; Jongebreur, R.

doi:10.1016/0304-8853(83)90097-5

Cited by 756 publications

(314 citation statements)

References 16 publications

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“…[6,12,19,25,26] On the other hand, atom substitution in binary alloys can drastically increase the transition temperature to enlarge the range of the Heusler phase, specifically, in binary Fe 3 Al with BiF 3 -type structure and/or in ternary MnCu 2 Al-type by substitution of Al by Si [27] or of Fe by M (M = Ti, [4,16] V, Cr, Mn, and Mo [26,28] ), respectively. For the ternary alloys, TiFe 2 Al and TiNi 2 Al, past efforts focused on physical properties, [3,8,11,12,[29][30][31] lattice parameters, [6,19,[32][33][34][35][36][37][38][39][40] and structure evaluations. [36] However, no investigation is known dealing with detailed atomic site preference in the Heusler phase of the quaternary system Ti-Fe-Ni-Al.…”

Section: Introductionmentioning

confidence: 99%

The Heusler Phase Ti25(Fe50 − x Ni x )Al25 (0 ≤ x ≤ 50); Structure and Constitution

Yan

Grytsiv

Rogl

et al. 2008

J Phs Eqil and Diff

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Alloys with composition Ti 25 (Fe 50 2 x Ni x )Al 25 (0 £ x £ 50) were investigated employing electron probe microanalysis (EPMA) and X-ray powder diffraction (XPD). For TiFe 2 Al, in situ neutron powder diffraction (ND) was used for the inspection of phase constitution covering the temperature range from 27°C (300 K) to 1277°C (1550 K). Combined Rietveld refinement of ND and XPD data for TiFe 2 Al revealed that Fe atoms occupy the 8c site in space group Fm " 3m; Ti with a small amount of Al sharing the 4a site, and the remaining Ti and Al atoms adopting the 4b site. This structural model was successfully applied in the refinement of all alloys Ti 25 (Fe 50 2 x Ni x )Al 25 (0 £ x £ 50). Partial atom order exists on the Fe-rich side while complete order is observed for the Ni-rich side. Profiles recorded by in situ neutron powder diffraction for TiFe 2 Al in the range of investigated temperatures show two phases, namely Heusler phase and MgZn 2 -type Laves phase. Diffraction peaks from the Heusler phase dominate the profiles at lower temperatures but at higher temperatures the MgZn 2 -type Laves phase is the main phase. No CsCl-type phase was found in the alloy in the investigated temperature range. The thermal expansion coefficient of TiFe 2 Al is 1.4552310 25 K 21 .

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Section: Introductionmentioning

confidence: 99%

The Heusler Phase Ti25(Fe50 − x Ni x )Al25 (0 ≤ x ≤ 50); Structure and Constitution

Yan

Grytsiv

Rogl

et al. 2008

J Phs Eqil and Diff

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“…[1][2][3][4] Spin-polarized currents can be generated several ways: by passing an unpolarized current through a ferromagnetic contact, using the spin-Hall or spin-Seebeck effects, by ballistic and hot electron injection, by employing spin-polarized materials such as half-metals, or using a spin-filter material. Half metals [5][6][7][8][9] and spin-filter (SF) materials 10,11 are especially suitable for spin injectors that are based on magnetic tunnel junctions (MTJs). 12 Furthermore, a spin injector using a spin-filter material is simpler, as it does not require magnetic electrodes.…”

mentioning

confidence: 99%

Synthesis of low-moment CrVTiAl: A potential room temperature spin filter

Stephen

McDonald

Lejeune

et al. 2016

Applied Physics Letters

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The efficient production of spin-polarized currents at room temperature is fundamental to the advancement of spintronics. Spinfilter materials -semiconductors with unequal band gaps for each spin channel -can generate spin-polarized current without the need for spin-polarized contacts. In addition, a spin-filter material with zero magnetic moment would have the advantage of not producing strong fringing fields that would interfere with neighboring electronic components and limit the volume density of devices. The quaternary Heusler compound CrVTiAl has been predicted to be a zero-moment spin-filter material with a Curie temperature in excess of 1000 K. In this work, CrVTiAl has been synthesized with a lattice constant of a = 6.15 Å. Magnetization measurements reveal an exceptionally low moment of μ = 2.3 x 10 -3 µB/f.u. at a field of μ0H = 2 T, that is independent of temperature between T = 10 K and 400 K, consistent with the predicted zero-moment ferrimagnetism. Transport measurements reveal a combination of metallic and semiconducting components to the resistivity. Combining a zero-moment spin-filter material with nonmagnetic electrodes would lead to an essentially nonmagnetic spin injector. These results suggest that CrVTiAl is a promising candidate for further research in the field of spintronics.Future spintronic devices rely on the production of spin-polarized currents at room temperature.1-4 Spin-polarized currents can be generated several ways: by passing an unpolarized current through a ferromagnetic contact, using the spin-Hall or spin-Seebeck effects, by ballistic and hot electron injection, by employing spin-polarized materials such as half-metals, or using a spin-filter material. Half metals 5-9 and spin-filter (SF) materials 10,11 are especially suitable for spin injectors that are based on magnetic tunnel junctions (MTJs). 12 Furthermore, a spin injector using a spin-filter material is simpler, as it does not require magnetic electrodes.Spin-filter materials are magnetic semiconductors where the two spin states have unequal band gaps, shown in Fig. 1. When unpolarized electrons tunnel through a thin SF barrier they encounter a potential barrier that is lower for one spin state. As the tunneling probability increases exponentially with decreasing barrier height, the current for one spin direction will be much larger than for the other spin direction, thus creating a spin-polarized current. In practice, a spin filter is a simple MTJ-based device with the tunneling insulator replaced by the SF material, but more importantly, the magnetic MTJ electrodes are replaced by a nonmagnetic metal.13 This polarizing effect can be varied by applying a voltage to the spin-filter electrodes, hence creating a tunable spin valve. Spin filter devices have been fabricated with the magnetic semiconductor EuS 11,14 ; unfortunately, its low Curie temperature (TC = 16 K) limits its applicability.

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“…Êоординаты атомов заданы здесь в долях длин рёбер элементарных ячеек обсуждаемых соединений. Экспериментально реализуемые конфигурации соответствуют K = 1 [10][11][12], а остав-шиеся отличаются от них «перемешиванием» атомов. Отметим, что позиции 4a и 4b формируют решётку типа NaCl, тогда как 4a и 4с -структуру цинковой обманки [1].…”

Section: методика проведения расчётовunclassified

“…Поляризация состояний фермиевских электронов сплавов с кобальтом и никелем в конфигурациях их основного состояния (K = 1, 2) достигает своего максимума в одну единицу. Таким образом, оба этих сплава, дей-ствительно [10,12,[18][19][20], являются полуметаллами (semimetals). Подтверждается вывод и о том, что в основном состоянии сплав с ме-дью обладает металлическими свойствами [21].…”

Section: обсуждение полученных результатовunclassified

Distribution of Atoms on Crystallographic Positions in Heusler Alloys $M$MnSb ($M$ = Co, Ni, Cu) and Their Electronic Structure

Uvarov¹,

Uvarov²

2017

Metallofiz. Noveishie Tekhnol.

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Magneto-optical properties of metallic ferromagnetic materials

Cited by 756 publications

References 16 publications

The Heusler Phase Ti25(Fe50 − x Ni x )Al25 (0 ≤ x ≤ 50); Structure and Constitution

The Heusler Phase Ti25(Fe50 − x Ni x )Al25 (0 ≤ x ≤ 50); Structure and Constitution

Synthesis of low-moment CrVTiAl: A potential room temperature spin filter

Distribution of Atoms on Crystallographic Positions in Heusler Alloys $M$MnSb ($M$ = Co, Ni, Cu) and Their Electronic Structure

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