Magnetic properties study of spin pinned NiFe/FeMn/NiFe heterogeneous multilayer films with different NiFe thicknesses
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Magnetic properties study of spin pinned NiFe/FeMn/NiFe heterogeneous multilayer films with different NiFe thicknesses Yu Liu1 · Zhongwen Lan1 · Zhong Yu1 · Rongdi Guo1 · Xiaona Jiang1 · Chuanjian Wu1 · Ke Sun1 Received: 27 May 2020 / Accepted: 21 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract FM (ferromagnetic)/AF (antiferromagnetic) heterogeneous multilayer films, with high-saturation magnetization (4πMs), low coercivity (Hc), and low ferromagnetic resonance (FMR) linewidth (∆H), have great application prospects in microwave/millimeter-wave devices. In this study, the N i81Fe19 (t nm)/Fe50Mn50 (15 nm)/Ni81Fe19 (t nm) films were fabricated by DC magnetron sputtering, and the effects of thickness of the Ni81Fe19 on the microstructure, static magnetic properties and microwave properties were investigated. With the increasing thickness of N i81Fe19 film, the saturation magnetization increased from 658 to 754 emu/m3. The in-plane and out-of-plane coercivity both decreased first and then increased, and ∆H decreased first and then raised from 193 to 95 Oe. When the thickness of the Ni–Fe film is 50 nm, the transition of the out-of-plane exchange bias field from the negative exchange bias to the positive exchange bias occurred. Remarkably, with a 50 nm Ni81Fe19 film, the multilayer films achieved excellent performance with high-saturation magnetization (4πMs, 722 emu/m3), low in-plane coercivity (Hc, 0.61 Oe), and low FMR linewidth (∆H, 95 Oe). The outstanding heterogeneous multilayer films exhibit great potentials in microwave/millimeter-wave devices. Keywords Nife/femn/NiFe trilayers · Magnetron sputtering · Surface morphology · Ferromagnetic resonance
1 Introduction Magnetic materials have attracted widespread attention as an important component of today’s microwave/millimeterwave devices, such as inductors, magnetic tunable filters, circulators, isolators, and phase shifters [1–5]. To meet the trend of miniaturization and high-frequency development, a large amount of research have focused on magnetic thinfilm materials including single and multilayer films [6–12]. Compared with traditional ferrite materials, such as YIG and NiZn, metal soft-magnetic materials have higher saturation magnetization, higher permeability and higher ferromagnetic resonance frequency, which have great application prospects in microwave/millimeter-wave devices. The frequency of ferromagnetic resonance determines the application frequency of devices, such as magnetic tunable filters [4,13–15]. To improve the working frequency of * Yu Liu [email protected] 1
School of Materials and Energy, University of Electronic Science and Technology of China, No.4, Section 2, North Jianshe Road, Chengdu 610054, China
devices, many scholars have focused on ferromagnetic (FM)/ antiferromagnetic (AF) multilayers [16–26]. Introducing antiferromagnetic materials to pin the metal ferromagnetic films for improving the effective anisotropic field of ferromagnetic materials through the exchange coupling between fe
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