Interface magnetization transition via minority spin injection

The interfacemagnetization of n-type BaTiO3/La0.7Sr0.3MnO3heterojunction is selectively probed by magnetic second-harmonic generation at 80  K. The injection of minority spins at the interface causes a sudden, reversibletransition of the spin alignment of interfacial Mn ions fromferromagnetic toantiferromagnetic exchange coupled, while the bulkmagnetization remains unchanged. We attribute the emergent interfacialantiferromagnetic interactions to weakening of the double-exchange mechanism caused by the strong Hund's rule coupling between injected minority spins and local magnetic moments. Theeffect is robust and may serve as a viable route for electronic and spintronic applications.

Source: Applied Physics Letters - December 7, 2016 Category: Physics Authors: F. Fang, H. Zhai, X. Ma, Y. W. Yin, Qi Li and G. L üpke Source Type: research