Effect of Pt and FePt Layer Thickness on Microstructure and Magnetic Properties of L10 FePt Films With Perpendicular Anisotropy
- Effect of Pt and FePt Layer Thickness on Microstructure and Magnetic Properties of L10 FePt Films With Perpendicular Anisotropy
- 천동원; 조민경; 김지영; 홍재영; 배지환; 김긍호; Tae Kyoung Kim; Hyeon Min Kim; Heon-Young Ha
- Issue Date
- IEEE transactions on magnetics
- VOL 55, NO 8-3200506-6
- 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.
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