Low-temperature resistivity anomaly and weak spin disorder in 
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 epitaxial thin films

Tong, Shucheng; Zhao, Xupeng; Wei, Dahai; Zhao, Jianhua

doi:10.1103/physrevb.101.184434

Cited by 18 publications

(15 citation statements)

References 44 publications

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“…The estimated

for Fe 2 YZ shown in Figure 2b had high values of 250–750 S cm −1 in the temperature range of 2 to 300 K, which are smaller than those of ordered Co 2 Mn Z SC, [ 22 , 26 , 32 , 46 ] but comparable to those obtained for the corresponding thin films. [ 33 , 43 , 44 , 45 ] Moreover, the

showed a very weak temperature dependence (Figure 2b ), which together with the σ xx ‐independence of

(Figure S5 , Supporting Information) suggest that the

of Fe 2 YZ is mostly a result of the intrinsic contribution, that is, the BC.…”

Section: Resultsmentioning

confidence: 99%

“…Although these values are smaller than that of the ordered Co 2 MnZ SC, they are comparable to those obtained in disordered Co 2 MnZ thin films. [33,44] xy | measured at 300 K for Fe 2 YZ, Co 2 MnGa [19,22,46] and Co 2 MnAl [32] SC, and Co 2 MnGa [43][44][45] and Co 2 Mn 1-x Si x [33] Figure 3c shows the calculated yx near room temperature. The anomalous component A yx of all four Fe 2 YZ SC reached values above 0.5 A m −1 K −1 , with a maximum value of 1.7 A m −1 K −1 , which is approaching the maximum value obtained in the representative magnetic Weyl systems Co 3 Sn 2 S 2 and Co 2 MnZ.…”

Section: Resultsmentioning

confidence: 99%

“…In previous studies on Co‐based magnetic Heusler compounds, the anti‐site disorder was thought to be unfavorable for increasing the AHE: compared to the large values in well‐ordered single crystals (SC) (900–1300 S cm −1 at 300 K), [ 22 , 26 , 32 ] Co 2 MnGa and Co 2 MnAl thin films with the anti‐site disorder generally had smaller

values (100–800 S cm −1 at 300 K). [ 33 , 43 , 44 , 45 ]…”

Section: Introductionmentioning

confidence: 99%

“…[ 36 ] Although the studied Fe 2 YZ SC showed strong anti‐site disorder, they showed large

values (250–700 S cm −1 ) and anomalous Nernst thermopower (2 µV K −1 near room temperature), comparable to those of the disordered Co 2 Mn Z system. [ 33 , 43 , 44 , 45 ] With the help of theoretical calculations, we argued that the anti‐site disorder in Fe 2 YZ can benefit their anomalous transport. Moreover, the anomalous Nernst thermopower of Fe 2 YZ shows an approximately linear increase with rising temperature, indicating higher values could be obtained at elevated temperatures considering their high T c values.…”

Section: Introductionmentioning

confidence: 99%

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Large Anomalous Hall and Nernst Effects in High Curie‐Temperature Iron‐Based Heusler Compounds

et al. 2021

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The interplay between topology and magnetism has recently sparked the frontier studies of magnetic topological materials that exhibit intriguing anomalous Hall and Nernst effects owning to the large intrinsic Berry curvature (BC). To better understand the anomalous quantum transport properties of these materials and their implications for future applications such as electronic and thermoelectric devices, it is crucial to discover more novel material platforms for performing anomalous transverse transport studies. Here, it is experimentally demonstrated that low-cost Fe-based Heusler compounds exhibit large anomalous Hall and Nernst effects. An anomalous Hall conductivity of 250-750 S cm −1 and Nernst thermopower of above 2 μV K −1 are observed near room temperature. The positive effect of anti-site disorder on the anomalous Hall transport is revealed. Considering the very high Curie temperature (nearly 1000 K), larger Nernst thermopowers at high temperatures are expected owing to the existing magnetic order and the intrinsic BC. This work provides a background for developing low-cost Fe-based Heusler compounds as a new material platform for anomalous transport studies and applications, in particular, near and above room temperature.

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“…The estimated

showed a very weak temperature dependence (Figure 2b ), which together with the σ xx ‐independence of

(Figure S5 , Supporting Information) suggest that the

of Fe 2 YZ is mostly a result of the intrinsic contribution, that is, the BC.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

values (100–800 S cm −1 at 300 K). [ 33 , 43 , 44 , 45 ]…”

Section: Introductionmentioning

confidence: 99%

“…[ 36 ] Although the studied Fe 2 YZ SC showed strong anti‐site disorder, they showed large

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Large Anomalous Hall and Nernst Effects in High Curie‐Temperature Iron‐Based Heusler Compounds

et al. 2021

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“…The inset shows the maximum value of each sample, as measured between 3 and 300 K. These results of thinner samples agree very well with ref. [170] in which the AHA of 6 nm Co 2 MnGa is no more than 2.8%. Figure 6.4(c) is the Log σ xy -σ xx plot for all samples measured at 300 to 3 K. σ xx is about 4.5 -7.5×10 3 Ω −1 cm −1 at various thicknesses and temperatures, and σ xy is nearly independent of σ xx .…”

Section: Magnetotransport Propertiesmentioning

confidence: 92%

Skyrmion generation and perpendicular magnetic anisotropy modification in Heusler alloy ultrathin films

Zhang¹

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This thesis explores the magnetic properties of Heusler alloy thin films for spintronics applications. The skyrmion generation under different externalstimulation was focused in MgO/Mn2CoAl/Pd ultrathin films and the anomalous Hall effect of Co2MnGa thin films. The perpendicularly magnetized MgO/Mn2CoAl/Pd ultrathin films were firstly optimised by changing the thickness of Pd layer so that the effective magnetic anisotropy can be tuned and various magnetic textures can be obtained for different purposes. Based on the understanding of Pd dependence of magnetic properties, The skyrmion generation by applying an in-plane magnetic field was investigated to fine tune the effective magnetic anisotropy. Further the fractal analysis was used to describe the evolution of the magnetic states and categorise the formation of skyrmions. Then skyrmion generation by ionic liquid gating has been investigated in this trilayer. Both non-volatile and volatile skyrmions can be generated by applying a range of voltage sequences. The potential mechanisms, magneto-ionic and electrostatic charge effects, have been discussed as well. Finally, the thickness dependence of Co2MnGa thin films was studied. This material can be used as a spin-orbit generator for manipulating skyrmions. A large anomalous Hall angle (AHA) was demonstrated in Co2MnGa thin films (20 - 50 nm) showing a AHA ~11.4% at low temperature and ~9.7% at room temperature, which can be ascribed to the nontrivial topology of the band structure with large intrinsic Berry curvature. However, the anomalous Hall angle decreases significantly with thicknesses below 20 nm, which band structure calculations confirm is due to the reduction of the majority spin contribution to the Berry curvature.

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Atomic disorder and intrinsic anomalous Hall effect in a half-metallic ferromagnet Co2VAl

Rastogi,

Kumar,

Jena

et al. 2025

Journal of Alloys and Compounds

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Low-temperature resistivity anomaly and weak spin disorder in Co2MnGa epitaxial thin films

Cited by 18 publications

References 44 publications

Large Anomalous Hall and Nernst Effects in High Curie‐Temperature Iron‐Based Heusler Compounds

Large Anomalous Hall and Nernst Effects in High Curie‐Temperature Iron‐Based Heusler Compounds

Skyrmion generation and perpendicular magnetic anisotropy modification in Heusler alloy ultrathin films

Atomic disorder and intrinsic anomalous Hall effect in a half-metallic ferromagnet Co2VAl

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