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Dresden 2006 – scientific programme

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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 20.28: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Magnetic anisotropy of magnetite thin films — •Andreas Brandlmaier, Andrea Boger, Matthias Opel, Sebastian T. B. Goennenwein, and Rudolf Gross — Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner-Str. 8, 85748 Garching

Magnetite (Fe3O4) is very promising for spintronic devices, since it is predicted to be a half-metallic ferrimagnet with a Curie-temperature TC=860 K. A detailed understanding of the magnetic properties, in particular magnetic anisotropy, therefore is of significant importance.
We have investigated epitaxial Fe3O4 thin films deposited by pulsed laser deposition in Ar atmosphere at a substrate temperature of 320C. The crystalline quality of the films was checked with x-ray diffraction, and the magnetic anisotropy was studied by means of ferromagnetic resonance (FMR) at a microwave frequency of 9.3 GHz.
In (001) oriented films, we observe a cubic magnetic anisotropy in the film plane, and a strong uniaxial magnetic anisotropy perpendicular to it. At room temperature, the cubic anisotropy field Kc1/M=0.6 mT is much smaller than the effective uniaxial anisotropy field Keff/M=430.0 mT, where the latter can be quantitatively understood in terms of demagnetization. In contrast, (111) oriented films exhibit uniaxial magnetic anisotropy both in and out of plane. We discuss possible origins of this unusual in-plane anisotropy. We furthermore address the influence of specimen shape and temperature on the magnetic properties.

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