Oscillatory Spin Polarization and Magneto-Optical Kerr Effect inFe3O4Thin Films on GaAs(001)

Yan Li, Wei Han, A. G. Swartz, K. Pi, J. J. I. Wong, S. Mack, D. D. Awschalom, R. K. Kawakami
2010 Physical Review Letters  
The spin dependent properties of epitaxial Fe3O4 thin films on GaAs(001) are studied by the ferromagnetic proximity polarization (FPP) effect and magneto-optic Kerr effect (MOKE). Both FPP and MOKE show oscillations with respect to Fe3O4 film thickness, and the oscillations are large enough to induce repeated sign reversals. We attribute the oscillatory behavior to spin-polarized quantum well states forming in the Fe3O4 film. Quantum confinement of the t2g states near the Fermi level provides
more » ... explanation for the similar thickness dependences of the FPP and MOKE oscillations.
doi:10.1103/physrevlett.105.167203 pmid:21231004 fatcat:3zyscxzpxbgdfloqwvyso26fga