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The magnetic and magnetotransport properties of Ni80Fe20/La0.7Sr0.3MnO3 (NiFe/LSMO) bilayers were investigated after bombarding the LSMO surface with low-energy Ar+ or O2+/Ar+ ion beams before the growth of the top NiFe layer. A variety of magnetic properties are revealed, including an asymmetric two-stepped hysteresis loop with an exchange bias loop shift, and alternatively, a symmetric two-stepped hysteresis loop with an enhanced coercivity. Polarized neutron reflectometry measurements provide details of the magnetic depth profile and interface layer magnetism at different temperatures. The LSMO surface modifications determine a complex magnetic and electric NiFe/LSMO interface having a strong effect on the magnetoresistance of the bilayer. Surface engineering based on ion beam bombardment is presented as a promising technique for optimizing the electronic and magnetic properties of …
AIP Publishing LLC
Publication date: 
14 Nov 2018

I Bergenti, Palash K Manna, C-H Lin, P Graziosi, X Liu, Grace L Causer, F Liscio, A Ruotolo, VA Dediu, Johan Van Lierop, Frank Klose, K-W Lin

Biblio References: 
Volume: 124 Issue: 18 Pages: 183903
Journal of Applied Physics