Abstract
This paper shows the formation of nanosized spin misalignment in pure Fe processed via high-pressure torsion straining.
Highlights
High-pressure torsion (HPT) is a renowned severe plastic deformation technique in metallurgy since it dramatically changes mechanical properties such as the tensile strength of structural materials [1,2,3,4,5]
The average grain size is estimated to be 380 nm, which is comparable with that described in a previous study and indicates that the crystal grains are remarkably refined through high-pressure torsion (HPT) straining [3]
The coercivity increases from nearly 0 to approximately 2 mT as a result of HPT straining. This may be attributed to the pinning of magnetic domain walls due to the high-density crystal defects and grain boundaries produced through HPT straining, as reported in previous studies [10,11]
Summary
High-pressure torsion (HPT) is a renowned severe plastic deformation technique in metallurgy since it dramatically changes mechanical properties such as the tensile strength of structural materials [1,2,3,4,5]. The characteristic nanostructures produced using the HPT process considerably modifies the crystal growth kinetics [8,9]. They can affect the magnetic properties owing to the pinning of magnetic domain walls and variation in exchange coupling between the grains [14,15,16]. Several researchers have reported an increase in the coercivity of magnetic materials via HPT straining [10,11]. In this study anomalous magnetic anisotropy produced via HPT straining in pure Fe is reported using small-angle neutron scattering (SANS), which is an excellent experimental technique for characterizing the nanostructure. Between the intrinsic spin of the neutron and the magnetic moments of the samples [22,23,24,25,26]
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