Direct observation of pinned/biased moments in magnetic superlattices
Abstract
We report the itpinned/biased itmoment in the superlattices consisting of ferromagnetic (FM) SrRuO3 and antiferromgnetic (AFM) SrMnO3. This superlattice system shows anisotropy and oriented pinning/biasing in the field-cooled (FC) hysteresis loop. The in-plane cooling-field provides antiferromagnetic orientations while out-of-plane cooling-field provides ferromagnetic orientations to the pinned/biased moments. The spacer layer thickness, strength and orientation of magnetic field, cooling field, and driving current influence the pinning strength. We propose that the magnetic structure is a repetition of AFM/Pin/FM(Free)/Pin unit below a critical field to explain its magnetic and transport properties. The transport behavior is discussed using the spin-dependent conduction.
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