Influence of the phenomena occurring at the interface between L1(0)-ordered-FePt and Fe on the coercivity behavior

Year: 2016

Authors: Carbucicchio M.

Autors Affiliation: Univ Parma, Dept Phys, Parco Area Sci 7-A, I-43124 Parma, Italy; CNR, Natl Opt Inst, Via Branze 45, I-25123 Brescia, Italy

Abstract: L1(0)-ordered FePt/Fe thin bi-layers were grown using a molecular beam epitaxy onto (100)-MgO substrates changing the soft Fe layer thickness. The study of the intermixing phenomena occurring at the hard/soft interfaces was carried out using surface Mossbauer spectroscopy. The magnetic properties of the samples were analyzed with a magneto-optical Kerr effect magnetometer. The surface morphology and the magnetic domains were analyzed with an UHV atomic and magnetic force microscopy in tapping and lift mode respectively. The present work clearly demonstrates that the degree of interface intermixing and reactions is the responsible for the coercivity behavior in exchange-spring magnets.

Conference title:

More Information: HYPERFINE INTERACTIONS Volume: 237
Article Number: 153
DOI: 10.1007/s10751-016-1366-6
KeyWords: Exchange-spring magnets; Perpendicular anisotropy; L1(0) -ordered systems; Interface phenomena; Mossbauer spectroscopy