Single and multidomain characteristics of GaMnAs investigated by magnetotransport measurements

Jungtaek Kim; D. Y. Shin; Taehee Yoo; Hyungchan Kim; Sanghoon Lee; X. Liu; J. K. Furdyna

doi:10.1063/1.2828532

Single and multidomain characteristics of GaMnAs investigated by magnetotransport measurements

Jungtaek Kim, D. Y. Shin, Taehee Yoo, Hyungchan Kim, Sanghoon Lee, X. Liu, J. K. Furdyna

Department of Physics

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

We have investigated the magnetization reorientation process of GaMnAs ferromagnetic films by changing external field direction in planar Hall effect (PHE) measurement. While the angular dependences of PHE data taken with clockwise and counterclockwise under strong magnetic field (i.e., above 400 Oe) are completely overlapped without hysteresis, they are significantly different under small magnetic field (i.e., below 50 Oe) by exhibiting nonabrupt hysteresis. We have analyzed such angular dependence of PHE using the magnetic free energy based on Stoner-Wohlfarth model. The behavior observed under the high field was well understood in terms of coherent rotation of magnetization in the form of single domain. However, the nonabrupt hysteric behavior observed with low field cannot be explained by a single domain picture and requires involvement of multidomain structures.

Original language	English
Article number	07D101
Journal	Journal of Applied Physics
Volume	103
Issue number	7
DOIs	https://doi.org/10.1063/1.2828532
Publication status	Published - 2008

ASJC Scopus subject areas

Physics and Astronomy(all)

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abstract = "We have investigated the magnetization reorientation process of GaMnAs ferromagnetic films by changing external field direction in planar Hall effect (PHE) measurement. While the angular dependences of PHE data taken with clockwise and counterclockwise under strong magnetic field (i.e., above 400 Oe) are completely overlapped without hysteresis, they are significantly different under small magnetic field (i.e., below 50 Oe) by exhibiting nonabrupt hysteresis. We have analyzed such angular dependence of PHE using the magnetic free energy based on Stoner-Wohlfarth model. The behavior observed under the high field was well understood in terms of coherent rotation of magnetization in the form of single domain. However, the nonabrupt hysteric behavior observed with low field cannot be explained by a single domain picture and requires involvement of multidomain structures.",

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AU - Kim, Jungtaek

AU - Shin, D. Y.

AU - Yoo, Taehee

AU - Kim, Hyungchan

AU - Lee, Sanghoon

AU - Liu, X.

AU - Furdyna, J. K.

PY - 2008

Y1 - 2008

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AB - We have investigated the magnetization reorientation process of GaMnAs ferromagnetic films by changing external field direction in planar Hall effect (PHE) measurement. While the angular dependences of PHE data taken with clockwise and counterclockwise under strong magnetic field (i.e., above 400 Oe) are completely overlapped without hysteresis, they are significantly different under small magnetic field (i.e., below 50 Oe) by exhibiting nonabrupt hysteresis. We have analyzed such angular dependence of PHE using the magnetic free energy based on Stoner-Wohlfarth model. The behavior observed under the high field was well understood in terms of coherent rotation of magnetization in the form of single domain. However, the nonabrupt hysteric behavior observed with low field cannot be explained by a single domain picture and requires involvement of multidomain structures.

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