Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.14: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Investigation of the magnetic anisotropy of Ga_1−xMn_xP via ferromagnetic resonance spectroscopy — •Michael Kraus¹, Christoph Bihler¹, Martin S. Brandt¹, Mike A. Scarpulla², Rouin Farshchi², and Oscar D. Dubon² — ¹Walter Schottky Institut, Technische Universität München, 85748 Garching, Germany — ²Department of Materials Science and Engineering, University of California at Berkeley and Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Recently, Scarpulla and coworkers [1] have shown that Ga_1−xMn_xP can be ferromagnetic with a Curie temperature of up to 65 K (x=0.06). In Ga_1−xMn_xP, the ferromagnetic exchange interaction is presumed to be mediated by localized holes in a Mn-impurity band, which is separated from the GaP holes band by ∼26 meV. In this contribution, we present an analysis of the magnetic anisotropy of this novel diluted magnetic semiconductor by means of ferromagnetic resonance (FMR) spectroscopy. We attribute the angular dependence of the FMR fields to the presence of a cubic magnetic anisotropy along the main crystalline <100> axes and two additional uniaxial magnetic anisotropies along the [100] growth direction and the in-plane [001] axis. Possible origins of these anisotropies will be discussed. Upon post-growth incorporation of hydrogen, the ferromagnetism in Ga_1−xMn_xP disappears, caused by a reduction of the hole concentration, as previously observed for hydrogenated Ga_1−xMn_xAs.

[1] M. A. Scarpulla, B. L. Cardozo, R. Farshchi, W. M. Hlaing Oo, M. D. McCluskey, K. M. Yu, and O. D. Dubon, Phys. Rev. Lett. 95, 207204 (2005)