Intrinsic exchange biasing in MnAs epilayers grown on (001) GaAs

S. H. Chun; S. J. Potashnik; K. C. Ku; J. J. Berry; P. Schiffer; N. Samarth

doi:10.1063/1.1367306

Intrinsic exchange biasing in MnAs epilayers grown on (001) GaAs

S. H. Chun, S. J. Potashnik, K. C. Ku, J. J. Berry, P. Schiffer, N. Samarth

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Abstract

We have studied the magnetic properties of MnAs epilayers grown in two preferred orientations on (001) GaAs by molecular-beam epitaxy. Samples with the (1 100) MnAs parallel to (001) GaAs ("type A") show asymmetric hysteresis loops and an anomalous temperature dependence of the coercive field. We attribute these anomalies to intrinsic exchange biasing effects arising from the presence of a strain-induced antiferromagnetic β-MnAs phase that coexists with the ferromagnetic α-MnAs phase. These unusual effects vanish with decreasing sample thickness, suggesting a strategy for suppressing the antiferromagnetic β-MnAs phase.

Original language	English (US)
Pages (from-to)	2530-2532
Number of pages	3
Journal	Applied Physics Letters
Volume	78
Issue number	17
DOIs	https://doi.org/10.1063/1.1367306
State	Published - Apr 23 2001

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.1367306

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abstract = "We have studied the magnetic properties of MnAs epilayers grown in two preferred orientations on (001) GaAs by molecular-beam epitaxy. Samples with the (1 100) MnAs parallel to (001) GaAs ({"}type A{"}) show asymmetric hysteresis loops and an anomalous temperature dependence of the coercive field. We attribute these anomalies to intrinsic exchange biasing effects arising from the presence of a strain-induced antiferromagnetic β-MnAs phase that coexists with the ferromagnetic α-MnAs phase. These unusual effects vanish with decreasing sample thickness, suggesting a strategy for suppressing the antiferromagnetic β-MnAs phase.",

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T1 - Intrinsic exchange biasing in MnAs epilayers grown on (001) GaAs

AU - Chun, S. H.

AU - Potashnik, S. J.

AU - Ku, K. C.

AU - Berry, J. J.

AU - Schiffer, P.

AU - Samarth, N.

PY - 2001/4/23

Y1 - 2001/4/23

N2 - We have studied the magnetic properties of MnAs epilayers grown in two preferred orientations on (001) GaAs by molecular-beam epitaxy. Samples with the (1 100) MnAs parallel to (001) GaAs ("type A") show asymmetric hysteresis loops and an anomalous temperature dependence of the coercive field. We attribute these anomalies to intrinsic exchange biasing effects arising from the presence of a strain-induced antiferromagnetic β-MnAs phase that coexists with the ferromagnetic α-MnAs phase. These unusual effects vanish with decreasing sample thickness, suggesting a strategy for suppressing the antiferromagnetic β-MnAs phase.

AB - We have studied the magnetic properties of MnAs epilayers grown in two preferred orientations on (001) GaAs by molecular-beam epitaxy. Samples with the (1 100) MnAs parallel to (001) GaAs ("type A") show asymmetric hysteresis loops and an anomalous temperature dependence of the coercive field. We attribute these anomalies to intrinsic exchange biasing effects arising from the presence of a strain-induced antiferromagnetic β-MnAs phase that coexists with the ferromagnetic α-MnAs phase. These unusual effects vanish with decreasing sample thickness, suggesting a strategy for suppressing the antiferromagnetic β-MnAs phase.

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Intrinsic exchange biasing in MnAs epilayers grown on (001) GaAs

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