Dresden 2003 – scientific programme
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MA: Magnetismus
MA 16: Anisotropie, Magnetoelastizit
ät
MA 16.1: Talk
Wednesday, March 26, 2003, 15:15–15:30, HSZ/04
Temperature Dependence of CrO2 Magnetic Moments and the Magnetocrystalline Anisotropy Energy — •Stefan Gold1, Eberhard Goering1, Gisela Schütz1, Christian König2, Ulrich Rüdiger2, and Gernot Güntherodt2 — 1Max-Planck-Insitut für Metallforschung, 70569 Stuttgart — 2II Physikalisches Institut der RWTH-Aachen, 52056 Aachen
Soft X-ray magnetic circular dichroism (XMCD) spectra have been investigated in the temperature range from 25 K to 350 K and for different crystallographic projections for CrO2 in the total electron yield (TEY) mode at the Synchrotron BESSY II, Berlin. The Bruno model [1] suggested a relationship of projected orbital moments, spin-orbit coupling and the magnetocrystalline anisotropy energy (MCA) in a cubic crystal field, but the relationship of projected magnetic moments and the MCA, especially as a function of temperature, is not known. CrO2 shows a strong anisotropic behavior for the orbital moment and the magnetic dipole term TZ. The TZ-term and the orbital moment favor different easy axes, and the TZ-term dominates the magnetic anisotropy, which has been interpreted quantitatively by the van der Laan model [2,3]. Temperature dependent measurements of spin, orbital and TZ-moments simultaneously with the MCA, deduced from in situ hysteresis curves, confirms the van der Laan-model [3] for the generation of L(T),TZ(T) and the MCA(T). [1] Bruno, P., PRB 39 (1989) 865; [2] Goering, E., et al., PRL 88 (2002) 207203; [3] van der Laan, G., J. Phys.: Cond. Matt. 10 (1998) 3239;