Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Poster Session
MM 17.71: Poster
Montag, 26. März 2012, 17:00–19:00, Poster B
Comparison of MOKE- and SQUID-detected magnetization of FePt-layers on MgO-substrates — •Peter Jerabek1, Thomas Bublat2, Dagmar Goll3, Stefan Topolovec4, Roland Würschum4, and Heinz Krenn1 — 1Karl-Franzens-University Graz, Graz, Austria — 2Max Planck Institut für Intelligente Systeme, Stuttgart, Germany — 3Aalen University, Materials Research Institute, Aalen, Germany — 4Institut für Materialphysik, TU Graz, Graz, Austria
Chemically ordered FePt in the L10 phase is known as hard magnetic material with an extremely high magnetic anisotropy. From SQUID measurements [1] different mechanisms of magnetization reversal have been recognized: nucleation or pinning of domain walls depending on the layer thickness, on the degree of chemical order and on the grain size distribution. Coherent rotation or domain wiping determines the coercivity. SQUID magnetometry allows to monitor (and calibrate) the in-field- and the the out-of-field magnetization, but the Magnetooptic Kerr Effect (MOKE) provides additional information about the dynamics of magnetization reversal. The enhanced surface sensitivity of MOKE is utilized to account for the electric tunability [2] of magnetization by soaking FePt/MgO-films in KCl electrolyte, for which a special electrochemical cell including a reference electrode is designed.
[1] T. Bublat, D. Goll, J. Appl. Phys. 108 (2010) 113910
[2] M. Weisheit et al., Science 315 (2007) 349