Magnetocrystalline anisotropy and magnetization reversal in Ga1xMnxP synthesized by ion implantation and pulsed-laser melting

C. Bihler, M. Kraus, H. Huebl, M. S. Brandt, S. T. B. Goennenwein, M. Opel, M. A. Scarpulla, P. R. Stone, R. Farshchi, and O. D. Dubon
Phys. Rev. B 75, 214419 – Published 18 June 2007

Abstract

We report the observation of ferromagnetic resonance (FMR) and the determination of the magnetocrystalline anisotropy in (100)-oriented single-crystalline thin film samples of Ga1xMnxP with x=0.042. The contributions to the magnetic anisotropy were determined by measuring the angular and the temperature dependencies of the FMR resonance fields and by superconducting quantum interference device magnetometry. The largest contribution to the anisotropy is a uniaxial component perpendicular to the film plane; however, a negative contribution from cubic anisotropy is also found. Additional in-plane uniaxial components are observed at low temperatures, which lift the degeneracy between the in-plane [011] and [011¯] directions as well as between the in-plane [010] and [001] directions. Near T=5K, the easy magnetization axis is close to the in-plane [011¯] direction. All anisotropy parameters decrease with increasing temperature and disappear above the Curie temperature TC. A consistent picture of the magnetic anisotropy of ferromagnetic Ga1xMnxP emerges from the FMR and magnetometry data. The latter can be successfully modeled when both coherent magnetization rotation and magnetic domain nucleation are considered.

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  • Received 22 March 2007

DOI:https://doi.org/10.1103/PhysRevB.75.214419

©2007 American Physical Society

Authors & Affiliations

C. Bihler*, M. Kraus, H. Huebl, and M. S. Brandt

  • Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, 85748 Garching, Germany

S. T. B. Goennenwein and M. Opel

  • Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner-Strasse 8, 85748 Garching, Germany

M. A. Scarpulla, P. R. Stone, R. Farshchi, and O. D. Dubon

  • Department of Materials Science and Engineering, University of California, Berkeley and Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

  • *bihler@wsi.tum.de
  • Present address: Materials Department, University of California, Santa Barbara, CA 93106, USA. mikes@engineering.ucsb.edu

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Issue

Vol. 75, Iss. 21 — 1 June 2007

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