Abstract
Fe-Si-B-Nb-Cu alloys are attractive for high frequency applications due to their low coercivity and high saturation magnetization. Here, we study the effect of stress annealing on magnetic microstructure in Fe73.5Si15.5B7Nb3Cu1 using off-axis electron holography and the Fresnel mode of Lorentz transmission electron microscopy. A stress of 50 MPa was applied to selected samples during rapid annealing for 4 s, resulting in uniaxial anisotropy perpendicular to the stress direction. The examination of focused ion beam milled lamellae prepared from each sample revealed a random magnetic domain pattern in the sample that had been rapidly annealed in the absence of stress, whereas a highly regular domain pattern was observed in the stress-annealed sample. We also measured a decrease in domain wall width from ∼ 94 nm in the sample annealed without stress to ∼ 80 nm in the stress-annealed sample.
Highlights
Magnetic microstructure in a stressannealed Fe73.5Si15.5B7Nb3Cu1 soft magnetic alloy observed using offaxis electron holography and Lorentz microscopy
We study the effect of stress annealing on magnetic microstructure in Fe73.5Si15.5B7Nb3Cu1 using off-axis electron holography and the Fresnel mode of Lorentz transmission electron microscopy
The examination of focused ion beam milled lamellae prepared from each sample revealed a random magnetic domain pattern in the sample that had been rapidly annealed in the absence of stress, whereas a highly regular domain pattern was observed in the stress-annealed sample
Summary
Magnetic microstructure in a stressannealed Fe73.5Si15.5B7Nb3Cu1 soft magnetic alloy observed using offaxis electron holography and Lorentz microscopy. E. Dunin-Borkowski1 1Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, D-52425 Jülich, Germany 2Materials Chemistry, RWTH Aachen University, D-52074 Aachen, Germany 3Department for Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, D-40237 Düsseldorf, Germany 4Vacuumschmelze GmbH & Co KG, D-63450 Hanau, Germany (Presented 15 January 2016; received 6 November 2015; accepted 2 December 2015; published online 23 February 2016)
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