Effect of Pt and FePt Layer Thickness on Microstructure and Magnetic Properties of L10 FePt Films With Perpendicular Anisotropy

Title
Effect of Pt and FePt Layer Thickness on Microstructure and Magnetic Properties of L10 FePt Films With Perpendicular Anisotropy
Authors
천동원조민경김지영홍재영배지환김긍호Tae Kyoung KimHyeon Min KimHeon-Young Ha
Issue Date
2019-08
Publisher
IEEE transactions on magnetics
Citation
VOL 55, NO 8-3200506-6
Abstract
The effect of the thicknesses of the Pt intermediate layer and FePt magnetic layer in CrV/Pt/FePt multilayers on the microstructure and magnetic properties for the perpendicular magnetic anisotropy was investigated. The Pt (0– 4 nm) and FePt (7– 28 nm) layers were deposited on a 90 nm-thick Cr94V6 underlayer at 350 °C, and the crystal structure and magnetic properties of the fabricated CrV/Pt/FePt multilayers were characterized. X-ray diffraction and vibrating sample magnetometer measurements revealed that the out-of-plane coercivity (Hc− out) and squareness increase when the Pt intermediate layer is deposited between CrV and FePt because it protects against diffusion of Cr and V atoms into the FePt magnetic layer during deposition. In addition, we confirmed that Hc− out and squareness decrease with increasing FePt layer thickness in the range of 7– 28 nm. As a result, the maximum Hc− out, S, and squareness were obtained for a multilayer with a CrV thickness of 90 nm, Pt thickness of 2 nm, and FePt thickness of 7 nm. This paper shows that highly ordered FePt L10 (001) can be fabricated by sublayer thickness control.
URI
http://pubs.kist.re.kr/handle/201004/69732
ISSN
0018-9464
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