On the influence of nanometer-thin antiferromagnetic surface layer on ferromagnetic CrO 2

P. Das; A. Bajpai; Y. Ohno; H. Ohno; J. Müller

doi:10.1063/1.4751350

On the influence of nanometer-thin antiferromagnetic surface layer on ferromagnetic CrO ₂

P. Das, A. Bajpai, Y. Ohno, H. Ohno, J. Müller

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Abstract

We investigate the influence of naturally grown 2-5 nm thin surface layer of antiferromagnetic (AFM) Cr ₂O ₃ on the half metallic ferromagnet CrO ₂ by measuring the magnetic behavior of a single micro-crystal. The temperature variation of the magnetic stray fields of the micro-crystal measured by micro-Hall magnetometry shows an anomalous increase below ∼ 60 K. We find clear evidence that this behavior is due to the influence of the AFM surface layer. The average amplitude of the Barkahausen jumps exhibits a similar temperature dependence indicating that the AFM surface layer plays a role in defining the potential landscape seen by the domain configuration in the ferromagnetic grain.

Original language	English
Article number	053921
Journal	Journal of Applied Physics
Volume	112
Issue number	5
DOIs	https://doi.org/10.1063/1.4751350
Publication status	Published - 2012 Sept 1

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.4751350

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title = "On the influence of nanometer-thin antiferromagnetic surface layer on ferromagnetic CrO 2 ",

abstract = "We investigate the influence of naturally grown 2-5 nm thin surface layer of antiferromagnetic (AFM) Cr 2O 3 on the half metallic ferromagnet CrO 2 by measuring the magnetic behavior of a single micro-crystal. The temperature variation of the magnetic stray fields of the micro-crystal measured by micro-Hall magnetometry shows an anomalous increase below ∼ 60 K. We find clear evidence that this behavior is due to the influence of the AFM surface layer. The average amplitude of the Barkahausen jumps exhibits a similar temperature dependence indicating that the AFM surface layer plays a role in defining the potential landscape seen by the domain configuration in the ferromagnetic grain.",

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AU - Das, P.

AU - Bajpai, A.

AU - Ohno, Y.

AU - Ohno, H.

AU - Müller, J.

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Y1 - 2012/9/1

N2 - We investigate the influence of naturally grown 2-5 nm thin surface layer of antiferromagnetic (AFM) Cr 2O 3 on the half metallic ferromagnet CrO 2 by measuring the magnetic behavior of a single micro-crystal. The temperature variation of the magnetic stray fields of the micro-crystal measured by micro-Hall magnetometry shows an anomalous increase below ∼ 60 K. We find clear evidence that this behavior is due to the influence of the AFM surface layer. The average amplitude of the Barkahausen jumps exhibits a similar temperature dependence indicating that the AFM surface layer plays a role in defining the potential landscape seen by the domain configuration in the ferromagnetic grain.

AB - We investigate the influence of naturally grown 2-5 nm thin surface layer of antiferromagnetic (AFM) Cr 2O 3 on the half metallic ferromagnet CrO 2 by measuring the magnetic behavior of a single micro-crystal. The temperature variation of the magnetic stray fields of the micro-crystal measured by micro-Hall magnetometry shows an anomalous increase below ∼ 60 K. We find clear evidence that this behavior is due to the influence of the AFM surface layer. The average amplitude of the Barkahausen jumps exhibits a similar temperature dependence indicating that the AFM surface layer plays a role in defining the potential landscape seen by the domain configuration in the ferromagnetic grain.

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On the influence of nanometer-thin antiferromagnetic surface layer on ferromagnetic CrO ₂

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