Abstract
Fe73.9Cu1Nb3Si13.2B8.9 (Finemet) thin films were deposited on the glass substrates by means of radio frequency sputtering. The films thickness was varied from 10 to 200 nm. Heat treatment at temperatures of 350, 400 and 450 °C were performed for 30 minutes in order to control thin film structural state. The X-ray powder diffractometry revealed that the crystallization of α-FeSi nanograins took place only at 450 °C whilst the other samples stayed in the amorphous state. Relation between the structure and magnetic properties of the films was discussed in the framework of random magnetic anisotropy model and the concept of stochastic magnetic domains. The latter was investigated using magnetic force microscopy (MFM). MFM data showed formation of such magnetic domains only in samples thermally treated at 450 °C. There was a tendency of the magnetic domain size reduction with the thickness decrease.
Highlights
Nanocrystalline Fe73.9Cu1Nb3Si13.2B8.9 alloy that is well known as Finemet retains a high scientific and technological interest due to its excellent magnetic properties among the soft magnetic materials [1,2,3]
We present a study of magnetic microstructure of Fe73.9Cu1Nb3Si13.2B8.9 thin films depending on temperature of heat treatments and film thicknesses
Room temperature X-Ray diffraction (XRD) patterns of the as-prepared and annealed samples were measured in the angle range of 10° ≤ 2θ ≤ 120°
Summary
Nanocrystalline Fe73.9Cu1Nb3Si13.2B8.9 alloy that is well known as Finemet retains a high scientific and technological interest due to its excellent magnetic properties among the soft magnetic materials [1,2,3] Low coercivity and both high saturation magnetization and permeability determines a wide range of its applications as functional materials in power transformers, microwave devices, magnetic sensors and other [4,5,6]. These properties are caused by special microstructure of the alloy, which is characterized by randomly oriented ultrafine bcc α-FeSi grains uniformly dispersed in a residual Fe–Nb–B amorphous matrix. We present a study of magnetic microstructure of Fe73.9Cu1Nb3Si13.2B8.9 thin films depending on temperature of heat treatments and film thicknesses
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