Magnetoresistance anomalies in (Ga,Mn)As epilayers with perpendicular magnetic anisotropy

G. Xiang; A. W. Holleitner; B. L. Sheu; F. M. Mendoza; O. Maksimov; M. B. Stone; P. Schiffer; D. D. Awschalom; N. Samarth

doi:10.1103/PhysRevB.71.241307

Magnetoresistance anomalies in (Ga,Mn)As epilayers with perpendicular magnetic anisotropy

G. Xiang, A. W. Holleitner, B. L. Sheu, F. M. Mendoza, O. Maksimov, M. B. Stone, P. Schiffer, D. D. Awschalom, N. Samarth

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45 Scopus citations

Abstract

We report the observation of anomalies in the longitudinal magnetoresistance of tensile-strained Ga1-xMnxAs epilayers with perpendicular magnetic anisotropy. Magnetoresistance measurements carried out in the planar geometry (magnetic field parallel to the current density) reveal "spikes" that are antisymmetric with respect to the direction of the magnetic field. These anomalies always occur during magnetization reversal, as indicated by a simultaneous change in sign of the anomalous Hall effect. The data suggest that the antisymmetric anomalies originate in anomalous Hall effect contributions to the longitudinal resistance when domain walls are located between the voltage probes. This interpretation is reinforced by carrying out angular sweeps of H, revealing an antisymmetric dependence on the helicity of the field sweep.

Original language	English (US)
Article number	241307
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	71
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.71.241307
State	Published - Jun 15 2005
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.71.241307

Cite this

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title = "Magnetoresistance anomalies in (Ga,Mn)As epilayers with perpendicular magnetic anisotropy",

abstract = "We report the observation of anomalies in the longitudinal magnetoresistance of tensile-strained Ga1-xMnxAs epilayers with perpendicular magnetic anisotropy. Magnetoresistance measurements carried out in the planar geometry (magnetic field parallel to the current density) reveal {"}spikes{"} that are antisymmetric with respect to the direction of the magnetic field. These anomalies always occur during magnetization reversal, as indicated by a simultaneous change in sign of the anomalous Hall effect. The data suggest that the antisymmetric anomalies originate in anomalous Hall effect contributions to the longitudinal resistance when domain walls are located between the voltage probes. This interpretation is reinforced by carrying out angular sweeps of H, revealing an antisymmetric dependence on the helicity of the field sweep.",

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doi = "10.1103/PhysRevB.71.241307",

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T1 - Magnetoresistance anomalies in (Ga,Mn)As epilayers with perpendicular magnetic anisotropy

AU - Xiang, G.

AU - Holleitner, A. W.

AU - Sheu, B. L.

AU - Mendoza, F. M.

AU - Maksimov, O.

AU - Stone, M. B.

AU - Schiffer, P.

AU - Awschalom, D. D.

AU - Samarth, N.

PY - 2005/6/15

Y1 - 2005/6/15

N2 - We report the observation of anomalies in the longitudinal magnetoresistance of tensile-strained Ga1-xMnxAs epilayers with perpendicular magnetic anisotropy. Magnetoresistance measurements carried out in the planar geometry (magnetic field parallel to the current density) reveal "spikes" that are antisymmetric with respect to the direction of the magnetic field. These anomalies always occur during magnetization reversal, as indicated by a simultaneous change in sign of the anomalous Hall effect. The data suggest that the antisymmetric anomalies originate in anomalous Hall effect contributions to the longitudinal resistance when domain walls are located between the voltage probes. This interpretation is reinforced by carrying out angular sweeps of H, revealing an antisymmetric dependence on the helicity of the field sweep.

AB - We report the observation of anomalies in the longitudinal magnetoresistance of tensile-strained Ga1-xMnxAs epilayers with perpendicular magnetic anisotropy. Magnetoresistance measurements carried out in the planar geometry (magnetic field parallel to the current density) reveal "spikes" that are antisymmetric with respect to the direction of the magnetic field. These anomalies always occur during magnetization reversal, as indicated by a simultaneous change in sign of the anomalous Hall effect. The data suggest that the antisymmetric anomalies originate in anomalous Hall effect contributions to the longitudinal resistance when domain walls are located between the voltage probes. This interpretation is reinforced by carrying out angular sweeps of H, revealing an antisymmetric dependence on the helicity of the field sweep.

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Magnetoresistance anomalies in (Ga,Mn)As epilayers with perpendicular magnetic anisotropy

Abstract

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