Magnetic anisotropy and magnetization reversal processes in Pt/Co/Pt films

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Kisielewski, M. | Maziewski, A. | Tekielak, M. | Ferré, J. | Lemerle, S. | Mathet, V. | Chappert, C.

Edité par CCSD ; Elsevier -

International audience. The dependence of the magnetic anisotropy, magnetization reversal processes and magnetic domain patterns in Pt/Co(h)/Pt(111) ultra-thin ferromagnetic films have been studied, as a function of the Co layer thickness d (0.5≤d≤3 nm), by magneto-optical polar Kerr magnetometry and microscopy. The anisotropy constants have been determined from the field-induced coherent rotation magnetization curves measured for different sets of in-plane, H∂, and perpendicular, H⊥, applied fields. The particular variation of Kerr rotation and anisotropy at small thickness (d<0.8nm) is discussed accounting of CoPt alloying at the interfaces. An abrupt spin reorientation transition from out-of-plane to in-plane has been experimentally evidenced over a narrow range of Co thickness. Irreversibility of the magnetization reversal starting from a demagnetized state and applying positive or negative H⊥ field is studied from the modifications of the magnetic relaxation and domain patterns. Irreversibility increases with Co thickness, but becomes negligible for an ultra-thin Co layer.

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