Optimization of half-Heusler PtMnSb alloy films for spintronic device applications

Wen, Zhenchao; Kubota, Takahide; Takanashi, Kōki

doi:10.1088/1361-6463/aadf4e

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…Similar argument can be applied for the other half-Heusler alloy films. PtMnSb films are deposited on Al 2 O 3 (0001) [ 96 , 99 ] and MgO(001) [ 103 ] by sputtering to form spin-valve structures, showing <1% giant magnetoresistance (GMR) at RT. This small GMR ratio may also be due to the empty site disorder at the interfaces.…”

Section: Introductionmentioning

confidence: 99%

Heusler alloys for spintronic devices: review on recent development and future perspectives

Elphick

Frost

Samiepour

et al. 2021

Science and Technology of Advanced Materials

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230

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Heusler alloys are theoretically predicted to become half-metals at room temperature (RT). The advantages of using these alloys are good lattice matching with major substrates, high Curie temperature above RT and intermetallic controllability for spin density of states at the Fermi energy level. The alloys are categorised into half- and full-Heusler alloys depending upon the crystalline structures, each being discussed both experimentally and theoretically. Fundamental properties of ferromagnetic Heusler alloys are described. Both structural and magnetic characterisations on an atomic scale are typically carried out in order to prove the half-metallicity at RT. Atomic ordering in the films is directly observed by X-ray diffraction and is also indirectly probed via the temperature dependence of electrical resistivity. Element specific magnetic moments and spin polarisation of the Heusler alloy films are directly measured using X-ray magnetic circular dichroism and Andreev reflection, respectively. By employing these ferromagnetic alloy films in a spintronic device, efficient spin injection into a non-magnetic material and large magnetoresistance are also discussed. Fundamental properties of antiferromagnetic Heusler alloys are then described. Both structural and magnetic characterisations on an atomic scale are shown. Atomic ordering in the Heusler alloy films is indirectly measured by the temperature dependence of electrical resistivity. Antiferromagnetic configurations are directly imaged by X-ray magnetic linear dichroism and polarised neutron reflection. The applications of the antiferromagnetic Heusler alloy films are also explained. The other non-magnetic Heusler alloys are listed. A brief summary is provided at the end of this review.

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Section: Introductionmentioning

confidence: 99%

Heusler alloys for spintronic devices: review on recent development and future perspectives

Elphick

Frost

Samiepour

et al. 2021

Science and Technology of Advanced Materials

Self Cite

230

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“…These materials have versatile properties that are very much sought after in different applications such as in the fabrication of new magnets [4] and spin valves as is the case in some devices [5]. Due to their half-metallic ferromagnetic properties, these compounds are destined to play an important role in the emerging field of spintronics [6][7][8][9][10]. In connection with the important issue of spin injection in these kinds of applications, among the best candidates are materials that are metallic for electrons of…”

Section: Introductionmentioning

confidence: 99%

Effect of Ga excess concentration on the structural, electronic, magnetic, elastic and thermoelectric properties of Fe2−xNiGa1+x Heusler alloys: results of FP-LAPW calculations

Chami

Lamari

Charifi³

2021

Eur. Phys. J. Plus

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The structural, electronic, magnetic, elastic and thermoelectric properties of Fe 2−x NiGa 1+x (x 0, 0.25, 0.5, 0.75, 1) Heusler alloys are investigated through ab initio calculations based on density functional theory (DFT) within the full potential linearized augmented plane wave (FP-LAPW) method. After substituting Fe by Ga in the unit cell, we find that the composition dependence of both the lattice constants and bulk modulii are not monotonous. Moreover, while these alloys still keep their metallic character, the calculated electronic structure shows an increase in the p-d and a corresponding decrease in the d-d orbital hybridizations between the transition metal and the main group elements. The distribution of the spin magnetic moments shows that these materials are ferromagnetic with their respective magnetic moments and Curie temperatures decreasing linearly with the Ga excess concentration x. The Fe 2−x NiGa 1+x Heusler alloys (x 0, 0.25, 0.5, 0.75, 1) we studied, are all found to be mechanically stable and, because of their high B/G ratio, ductile. The BoltzTraP code is used to assess the influence of Fe substitution by Ga on the transport properties. The Seebeck coefficient, electrical conductivity, thermal conductivity and figure of merit for the Fe 2−x NiGa 1+x alloy are all calculated.

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“…It exhibits a giant magneto-optical Kerr effect [21,22], which makes it attractive for magneto-optical recording. Furthermore, it exhibits a negative anisotropic magnetoresistance and it has been used for room-temperature giant magnetoresistance devices [23,24]. In this paper we discuss the SOT in PtMnSb with tetragonal and shear strain obtained from first principles density-functional theory calculations.…”

Section: Introductionmentioning

confidence: 99%

Spin-orbit torques in strained PtMnSb from first principles

Freimuth,

Blügel,

Mokrousov

2021

Preprint

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We compute spin-orbit torques (SOTs) in strained PtMnSb from first principles. We consider both tetragonal strain and shear strain. We find a strong linear dependence of the field-like SOTs on these strains, while the antidamping SOT is only moderately sensitive to shear strain and even insensitive to tetragonal strain. We also study the dependence of the SOT on the magnetization direction. In order to obtain analytical expressions suitable for fitting our numerical ab-initio results we derive a general expansion of the SOT in terms of all response tensors that are allowed by crystal symmetry. Our expansion includes also higher-order terms beyond the usually considered lowest order. We find that the dependence on the strain is much smaller for the higher-order terms than for the lowest order terms. In order to judge the sensitivity of the SOT on the exchange correlation potential we compute the SOT in both GGA and LDA. We find that the higher-order terms depend significantly on the exchange-correlation potential, while the lowest order terms are insensitive to it. Since the higher-order terms are small in comparison to the lowest order terms the total SOT is insensitive to the exchange correlation potential in strained PtMnSb.

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Optimization of half-Heusler PtMnSb alloy films for spintronic device applications

Cited by 6 publications

References 24 publications

Heusler alloys for spintronic devices: review on recent development and future perspectives

Heusler alloys for spintronic devices: review on recent development and future perspectives

Effect of Ga excess concentration on the structural, electronic, magnetic, elastic and thermoelectric properties of Fe2−xNiGa1+x Heusler alloys: results of FP-LAPW calculations

Spin-orbit torques in strained PtMnSb from first principles

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