Spin-Orbit Strength Driven Crossover between Intrinsic and Extrinsic Mechanisms of the Anomalous Hall Effect in the Epitaxial<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>L</mml:mi><mml:msub><mml:mn>1</mml:mn><mml:mn>0</mml:mn></mml:msub></mml:math>-Ordered Ferromagnets FePd and FePt

Seemann, K.; Mokrousov, Yuriy; Aziz, Atif; Miguel, J.; Kronast, Florian; Kuch, W.; Blamire, M. G.; Hindmarch, A. T.; Hickey, B. J.; Souza, Ivo; Marrows, C. H.

doi:10.1103/physrevlett.104.076402

Cited by 88 publications

(88 citation statements)

References 28 publications

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“…4(c). This is because the ξ is 0.6, 0.20, and 0.06 (eV) for Pt, Pd, and Fe atoms, respectively 27,38 and the effect of Fe atoms is negligible compared with those of Pd and Pt atoms. The present results of ξ are in good agreement with previous ab initio calculations 38 .…”

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confidence: 99%

“…The orbital momentum in 3d magnetic metallic films restored by the SOC is also proportional to the ξ and the PMA therefore is proportional to ξ 2 /W with the bandwidth of 3d electrons W 36 . Since the W does not change much with x, the enhanced PMA at high x is attributed to a larger ξ of Pt atoms compared with that of Pd atoms 27,37 . Our calculations show ξ change from 0.20, 0.26, 0.41 to 0.58 (eV) when x varying from 0, 0.5, 0.75, to 1.0, as shown in Fig.…”

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confidence: 99%

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Quadratic Scaling of Intrinsic Gilbert Damping with Spin-Orbital Coupling inL10FePdPt Films: Experiments andAb InitioCalculations

Zhang

et al. 2013

Phys. Rev. Lett.

148

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We have experimentally and theoretically investigated the dependence of the intrinsic Gilbert damping parameter α0 on the spin-orbital coupling strength ξ by using L10 ordered FePd1−xPtx ternary alloy films with perpendicular magnetic anisotropy. With the time-resolved magneto-optical Kerr effect, α0 is found to increase by more than a factor of ten when x varies from 0 to 1.0. Since changes of other leading parameters are found to be neglected, the α0 has for the first time been proven to be proportional to ξ 2 .

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confidence: 99%

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confidence: 99%

Quadratic Scaling of Intrinsic Gilbert Damping with Spin-Orbital Coupling inL10FePdPt Films: Experiments andAb InitioCalculations

Zhang

et al. 2013

Phys. Rev. Lett.

148

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“…In this region, large changes in the magnitude of the anomalous Hall current as well as relative orientation of the Hall current with respect to the magnetization can be easily achieved by simple reorientation of the sample's magnetization. While the former could be used in order to, e.g., tune the relative magnitudes of the extrinsic and intrinsic anomalous Hall signal, 6,29 among the most straightforward applications of the latter could be a realization of the planar Hall effect (PHE), 38 which is related to the Hall effect in ferromagnetic materials observed in a two-dimensional geometry with electric field, with magnetization and the Hall current sharing the same sample plane. So far, it is believed that, in most of the cases, the PHE originates from anisotropic magnetoresistance in metallic ferromagnets, although the PHE mechanism stemming from the anomalous Hall effect due to noncollinearity of the magnetization in semiconductor-based materials has been also suggested.…”

Section: Anisotropic Ahc In 3dpt Alloysmentioning

confidence: 99%

“…27 Recently, the AHE in FePt was used for injection of a spin-polarized current for consequent detection of direct and inverse spin Hall effect in Au. 28 In a combined experimental and theoretical study, 29 it was shown that the intrinsic contribution to the anomalous Hall signal dominates in samples of FePt with finite structural disorder. All this motivated our study of the anisotropy of the intrinsic AHE in uniaxial 3dPt alloys.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic intrinsic anomalous Hall effect in ordered3dPt alloys

2011

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By performing first-principles calculations, we investigate the intrinsic anomalous Hall conductivity (AHC) and its anisotropy in ordered L1 0 FePt, CoPt, and NiPt ferromagnets and their intermediate alloys. We demonstrate that the AHC in this family of compounds depends strongly on the direction of the magnetization M in the crystal. We predict that such pronounced orientational dependence in combination with the general decreasing trend of the AHC when going from FePt to NiPt leads to a sign change of the AHC upon rotating the magnetization direction in the crystal of CoPt alloy. We also suggest that, for a range of concentration x in Co x Ni 1−x Pt and Fe x Co 1−x Pt alloys, it is possible to achieve a complete quenching of the anomalous Hall current for a certain direction of the magnetization in the crystal. By analyzing the spin-resolved AHC in 3dPt alloys, we endeavor to relate the overall trend of the AHC in these compounds to the changes in their densities of d states around the Fermi energy upon varying the atomic number. Moreover, we show the generality of the phenomenon of anisotropic anomalous Hall effect by demonstrating its occurrence within the three-band tight-binding model.

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“…[1][2][3][4][5][6][7][8] It is widely accepted that there are three mechanisms responsible for the AHE. The intrinsic AHE arises from the transverse velocity of the Bloch electrons induced by SOI and interband mixing, 9 as experimentally evidenced by quantum anomalous Hall effect.…”

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Anomalous Hall effect in epitaxialL10-Mn1.5Ga films with variable chemical ordering

2014

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Abstract： The transport behaviors of weak localization and anomalous Hall effect (AHE) in perpendicularly magnetized L1 0 -Mn 1.5 Ga single-crystalline films are investigated as a function of degree of long-range chemical ordering and temperature. We observed significant weak localization and metal-insulator transition in highly disordered films. Our results provide new evidence that weak localization, phonons and magnons have negligibly smaller effect on extrinsic AHE resistivity than static defects for all the chemical disordered films, the overlook of which in conventional scaling laws may result in significant discrepancies and exponent n beyond 2 when fitting the data. Chemical disorder is found to exhibit strong tailoring effect on both intrinsic and extrinsic σ AH . Our results clarify the role of weak localization, phonons and magnons in AHE and offer a technological engineering approach of the AHE by altering long-range chemical ordering parameter of magnetic materials. Key words：Weak localization, Anomalous Hall effect, Chemical disorder, Perpendicular magnetic anisotropy, PACS: 72.15. Rn, 81.30.Hd, 75.30.Gw a) Author to whom correspondence should be addressed; Electronic mail: jhzhao@red.semi.ac.cnThe anomalous Hall effect (AHE) has attracted much attention due to both the fascinating underlying physics and the great application potential in sensors, memories and logics. [1][2][3][4][5][6][7][8] It is widely accepted that there are three mechanisms responsible for the AHE. The intrinsic AHE arises from the transverse velocity of the Bloch electrons induced by SOI and interband mixing, 9 as experimentally evidenced by quantum anomalous Hall effect. 10 The extrinsic mechanisms of skew scattering and side jump result from the impurity scattering of conduction electrons due to SOI. 11,12 Skew scattering yields a scaling relation between longitudinal resistivity ρ xx (conductivity σ xx =1/ρ xx ) and anomalous Hall resistivity ρ AH (conductivity σ AH ≈ρ AH /ρ xx 2 ) as ρ AH~ρxx , while other two mechanisms give ρ AH~ρxx 2 . Accordingly, scaling laws ρ AH~ρxx n and ρ AH =aρ xx +bρ xx 2 are conventionally used to describe the experimental data.In spite of the extensive studies, a unified scaling of AHE has remained a shortage. In stark contrast to present AHE theories, the exponent n was experimentally observed to be below 1 or beyond 2 in a variety of ferromagnets, e.g. 0.4 in hopping transport-accompanied Fe 3 O 4 films, 13 2.7 (2.85) in (111)-orientated Mn 2.03 Ga (Mn 1.38 Ga) films, 14 2.6 in Fe/Cr multilayers 15 and 3.7 in Co-Ag granular films. 16 Electron localization was recently found to yield a scaling with n=0 in chemically disordered FePt ultrathin films. 17 Noticeably, recent studies in Fe films revealed a negligible contribution of phonon skew scattering and a scaling ρ AH =a 0 ρ xx0 +bρ xx 2 , where a 0 ρ xx0 = α 0 ρ xx0 +βρ xx0 2 is the extrinsic contributions of skew scattering and side jump from static defects. 3 These intriguing observations make the scaling of AHE open questions. On the o...

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Spin-Orbit Strength Driven Crossover between Intrinsic and Extrinsic Mechanisms of the Anomalous Hall Effect in the EpitaxialL10-Ordered Ferromagnets FePd and FePt

Cited by 88 publications

References 28 publications

Quadratic Scaling of Intrinsic Gilbert Damping with Spin-Orbital Coupling inL10FePdPt Films: Experiments andAb InitioCalculations

Quadratic Scaling of Intrinsic Gilbert Damping with Spin-Orbital Coupling inL10FePdPt Films: Experiments andAb InitioCalculations

Anisotropic intrinsic anomalous Hall effect in ordered3dPt alloys

Anomalous Hall effect in epitaxialL10-Mn1.5Ga films with variable chemical ordering

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