Abstract
The dependence of magnetic anisotropy, magnetic domain patterns and magnetization reversal processes in [Pt/Co(tCo)/Cu]10 film stack epitaxied on Cu (111) substrate have been studied as a function of the Co layer thickness tCo, by magneto-optic polar Kerr magnetometry and microscopy. We find the film undergoes spin reorientation transition from out-of-plane to in-plane as tCo increases. The SRT thickness is verified by Rotating-field Magneto-Optic Kerr effect method. The film exhibits the stripe domain structures at remanence with the width decreasing while tCo approaches SRT. As demonstrated by the first order reversal curve measurement, the magnetization reversal process encompasses irreversible domain nucleation, domain annihilation at large field and reversible domain switching near remanence.
Highlights
In common magnetic materials, the ferromagnetic order is usually induced by the collinear exchange interaction
The dependence of magnetic anisotropy, magnetic domain patterns and magnetization reversal processes in [Pt/Co(tCo)/Cu]10 film stack epitaxied on Cu (111) substrate have been studied as a function of the Co layer thickness tCo, by magneto-optic polar Kerr magnetometry and microscopy
The hysteresis loops were measured in the polar magneto-optical Kerr effect (MOKE) geometry, and the magnetic anisotropies were determined quantitatively by the Rotating-of-field MOKE (ROTMOKE) technique.[25,26,27]
Summary
The ferromagnetic order is usually induced by the collinear exchange interaction. In materials with broken inversion symmetry and strong spin-orbit coupling, Dzyaloshinskii-Moriya interaction (DMI)[1,2] could stabilize interesting non-collinear chiral spin structure. One special particle-like chiral spin texture, attracts particular interests for its topologically protected nature and for the capability driven by ultra-low current density.[3] Magnetic Skyrmion was first observed in B20 compounds such as MnSi,[4] FeCoSi,[5,6] and FeGe,[7] in which non-centrosymmetric crystal structure induces bulk DMI. A fascinating topological hall effect was discovered in the skyrmion lattice systems.[8,9,10,11] Magnetic order in those bulk materials beyond ambient temperature is desirable.[12].
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