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Regensburg 2007 – scientific programme

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MA: Fachverband Magnetismus

MA 11: Magnetic Thin Films I

MA 11.8: Talk

Tuesday, March 27, 2007, 12:00–12:15, H10

Strain-controlled magnetic anisotropy of magnetite thin films — •Andreas Brandlmaier1, Mathias Weiler1, Stephan Geprägs1, Matthias Opel1, Hans Huebl2, Christoph Bihler2, Martin S. Brandt2, Sebastian T. B. Goennenwein1, and Rudolf Gross11Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Walter Schottky Institut, Technische Universität München, 85748 Garching, Germany

Controlling the crystalline strain in ferromagnetic thin films is a promising approach to multifunctional spintronic devices, since crystalline and magnetic degrees of freedom are connected via magneto-strictive effects. We have investigated magnetite (Fe3O4) thin films grown on (001)-oriented MgO substrates by pulsed laser deposition. Upon attaching these samples to piezoelectric actuators such that the main actuator elongation is parallel to a magnetite [100] direction, the magnetic anisotropy of the Fe3O4 layer can be manipulated. We quantify the effect of the piezo-induced strain on the magnetic anisotropy by monitoring the dependence of the Fe3O4 ferromagnetic resonance spectrum on the voltage V applied to the actuator. We find that at room temperature, the in-plane and out-of-plane uniaxial magnetic anisotropy constants Ku[010] and Ku[001] can be tuned by several 10 percent and about one percent, respectively, within the range of voltages applicable to the actuator. We quantitatively compare these findings to the magneto-strictive effects expected in magnetite, using high-resolution x-ray diffraction experiments as a function of V to determine the piezo-induced crystalline strain.

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