Magnetic properties and magnetization reversal process of L10 FePt/Fe bilayers magnetic thin films

• Published in: Applied surface science Vol. 258; no. 20; pp. 8124 - 8127
• Main Authors: Liu, Liwang, Sheng, Wei, Bai, Jianmin, Cao, Jiangwei, Lou, Yuanfu, Wang, Ying, Wei, Fulin, Lu, Jia
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier 01.08.2012
• Subjects: Coercive force; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Ferrous alloys; Hysteresis loops; Intermetallics; Iron; Iron compounds; Magnetization reversal; Physics; Platinum compounds; Thin films; Magnetization reversal; FePt; Magnetic domains; Exchange interaction; Coercive force; Coercivity; Magnetic domain; Iron; Magnetic thin films; Exchange interactions; Bilayers
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2012.05.006

The L10FePt (10nm)/Fe ( delta nm, delta =0-15) bilayers were fabricated by using magnetron co-sputtering. The L10FePt single layer shows good perpendicular orientation and the in-plane hysteresis loop shows almost a linear behavior. When delta is less than 3nm, the FePt/Fe bilayers show behaviors like one magnetic phase, the coercivities are close to the values determined by Zeeman energy. When delta is larger than 3nm, the in-plane hysteresis loops show behaviors similar to a soft magnetic film, the coercivities of the bilayers decreases slowly with the increasing Fe thickness because of confining by the exchange length of FePt layer and Fe layer. The measured coercivities values are optimally fitted by a 1/tFe1.15 relation. The magnetization reversal process and magnetic interaction were also investigated.