2022
DOI: 10.1103/physrevapplied.17.064052
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Large Anomalous Unidirectional Magnetoresistance in a Single Ferromagnetic Layer

Abstract: Unidirectional magnetoresistance (UMR) in a ferromagnetic bilayer due to the spin Hall effects (SHEs) provides a facile means of probing in-plane magnetization to avoid complex magnetic tunnel junctions.However, the UMR signal is very weak and usually requires a lock-in amplifier for detection even in the bilayer involving Ta or Pt with a large spin Hall angle (SHA). Here we report a type of UMR, termed as the anomalous UMR (AUMR), in a single CoFeB layer without any adjacent SHE layers, where the UMR signal i… Show more

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Cited by 10 publications
(4 citation statements)
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References 49 publications
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“…In this case, the minimum of R xx corresponds to H along the y direction. This does not agree with experimental data with a maximum value around β = 90° even though we consider that a spin current may be generated in a single ferromagnet with broken inversion symmetry. Therefore, we attribute the β scan results to the GSE-related magnetoresistance, in which the β dependence of R xx is also consistent with that observed in most ferromagnetic materials . As shown in Figure c, the AMR effects become more pronounced at 3 K, and the corresponding magnetoresistance ratio (MR) of γ scan increases about two times, as expected originating from ferromagnetic behaviors which are usually enhanced with decreasing temperature.…”
Section: Resultsmentioning
confidence: 62%
“…In this case, the minimum of R xx corresponds to H along the y direction. This does not agree with experimental data with a maximum value around β = 90° even though we consider that a spin current may be generated in a single ferromagnet with broken inversion symmetry. Therefore, we attribute the β scan results to the GSE-related magnetoresistance, in which the β dependence of R xx is also consistent with that observed in most ferromagnetic materials . As shown in Figure c, the AMR effects become more pronounced at 3 K, and the corresponding magnetoresistance ratio (MR) of γ scan increases about two times, as expected originating from ferromagnetic behaviors which are usually enhanced with decreasing temperature.…”
Section: Resultsmentioning
confidence: 62%
“…16−21 Unlike conventional magnetoresistances, the UMR is proportional to the applied current density and is odd under magnetization or current direction reversal, which violates the Onsager reciprocity. To date, UMR has been reported in numerous ferromagnetic (FM) material systems including metallic ferromagnets (Co, CoFeB), 16,18 semiconducting ferromagnets (GaMnAs), 19 magnetic topological insulators (Cr-doped BiSbTe), 20 and insulating ferromagnets (YIG), 21 etc. The observed FM UMR can mainly be attributed to two origins, i.e., spin-dependent electron scattering and spin-flip electron−magnon scattering.…”
mentioning
confidence: 99%
“…Recently, a new type of nonlinear magnetoresistance observed in the ferromagnet/heavy metal bilayer, namely, unidirectional magnetoresistance (UMR), has attracted intensive attention. Unlike conventional magnetoresistances, the UMR is proportional to the applied current density and is odd under magnetization or current direction reversal, which violates the Onsager reciprocity. To date, UMR has been reported in numerous ferromagnetic (FM) material systems including metallic ferromagnets (Co, CoFeB), , semiconducting ferromagnets (GaMnAs), magnetic topological insulators (Cr-doped BiSbTe), and insulating ferromagnets (YIG), etc. The observed FM UMR can mainly be attributed to two origins, i.e., spin-dependent electron scattering and spin-flip electron–magnon scattering. UMR is initially not expected in AFM materials where the spin polarizations of two magnetic sublattices cancel each other out.…”
mentioning
confidence: 99%
“…For comparison, we could not observe any magnetization reversal in CoFeB(2)/MgO(2) bilayers. Therefore, potential reversal mechanisms from CoFeB itself can be ruled out. Given the insulating property of CuO x , the Oersted field as well as the spin–vortex coupling effect caused by the inhomogeneous spatial distribution of the drift velocity of the conduction electrons in CuO x are further ruled out. , …”
mentioning
confidence: 99%