Nickel films deposited between amorphous silicon layers: Effects of annealing, Ni/Si interface and magnetic properties

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Marin Tadić, Matjaž Panjan, Janez Kovač, Miha Čekada, Peter Panjan
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引用次数: 0

Abstract

This study demonstrates exceptional magnetic properties associated with magnetic anisotropy in nickel layers approximately 23–28 nm thick, deposited between amorphous silicon layers (a-Si/Ni/a-Si) using triode sputtering. X-ray diffraction (XRD) analyses confirm the presence of the Ni phase in the samples. Furthermore, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) measurements reveal a trilayer structure consisting of nickel and silicon. These techniques also highlight the surface roughness of the nickel layer and detail the characteristics of the Ni/Si interface. Magnetic properties were evaluated using a vibrating sample magnetometer (VSM). The samples were annealed at temperatures up to 190 °C to optimize their magnetic characteristics. After annealing, the samples exhibited a high perpendicular remanence ratio (Mr/MS ≈ 1), high perpendicular coercivity (HC = 620 Oe), and a high effective perpendicular magnetic anisotropy energy density (Keff*t ≈ 1.16 erg/cm2). These properties are particularly interesting because of the substantial thickness of the nickel layer. Achieving nickel films thicker than 15 nm with perpendicular magnetic anisotropy (PMA) has been challenging. The origin of PMA is attributed to magnetoelastic anisotropy and internal strains, which are related to diffusion processes and thermal expansion mismatch between the Ni layer and the Ni/Si and a-Si layers.

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来源期刊
Applied Surface Science
Applied Surface Science 工程技术-材料科学:膜
CiteScore
12.50
自引率
7.50%
发文量
3393
审稿时长
67 days
期刊介绍: Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.
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