Atomistic observation of magnetization along a hysteresis loop in terbium/iron multilayers with perpendicular magnetic anisotropy inferred from site-selective -Mössbauer spectroscopy
Laboratorium für Angewandte Physik, Gerhard-Mercator-Universität
Duisburg D-47048 Duisburg, Germany
2 Hahn-Meitner Institut Berlin GmbH - D-14109 Berlin, Germany
Accepted: 8 February 1999
Iron-site selective -Mössbauer spectra in external fields perpendicular to the layers were measured along the magnetization-hysteresis loop in a hcp-Tb/bcc-Fe multilayer with out-of-plane magnetic orientation and large coercivity. In the multidomain region, two oppositely and out-of-plane magnetized domain states in the Fe layers are distinguished in the spectra. The Fe-spin direction was found to be at oblique angles with respect to the surface normal (and Bext direction), reminiscent of a cone state. Fe-spin rotation was directly observed along the hysteresis loop, and the bcc-Fe-specific magnetization loop was calculated from the Mössbauer results.
PACS: 76.80.+y – Mössbauer effect; other γ-ray spectroscopy / 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 75.60.-d – Domain effects, magnetization curves, and hysteresis
© EDP Sciences, 1999