Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.19: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

Observation of the Fe Spin Spiral Structure in Fe/Sm-Co Exchange Spring Bilayers by ⁵⁷Fe-Probe Layer Mössbauer Spectroscopy — •A. Khrenov¹, W. Keune¹, V.E. Kuncser², J.S. Jiang³ und S.D. Bader³ — ¹Angewandte Physik, Universität Duisburg-Essen, 47048 Duisburg — ²NIPM, RO-76900 Bucharest Magurele, Romania — ³Materials Science Div., Argonne National Laboratory, Argonne, IL 60439, USA

The layer resolved Fe spin spiral structure for Fe/Sm-Co(1100) exchange spring magnetic bilayers was investigated by ⁵⁷Fe conversion electron Mössbauer spectroscopy (CEMS) during the magnetization reversal process, and correlated with the hysteresis loops measured via the magneto-optic Kerr effect. 2 nm thick isotopically enriched ⁵⁷Fe-probe layers were sputter-deposited in the 20 nm thick natural Fe layer at different distances from the Fe/Sm-Co interface. A direct experimental proof for a relaxed spiral angular spin distribution in the Fe layer is presented. Contrary to expectation, weak out-of-plane Fe spin components were observed in a certain applied field range.
Sponsored through Deutsche Forschungsgemeinschaft (SFB491) and DOE Contract No. W.31-109-ENG-38.