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Article

Strain Induced Anisotropic Magnetic Behaviour and Exchange Coupling Effect in Fe-SmCo5 Permanent Magnets Generated by High Pressure Torsion

1
Erich Schmid Institute of Materials Science of the Austrian Academy of Sciences, 8700 Leoben, Austria
2
Institute of Physics, University of Graz, 8010 Graz, Austria
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(11), 1026; https://doi.org/10.3390/cryst10111026
Received: 14 October 2020 / Revised: 2 November 2020 / Accepted: 6 November 2020 / Published: 10 November 2020
(This article belongs to the Section Inorganic Crystalline Materials)
High-pressure torsion (HPT), a technique of severe plastic deformation (SPD), is shown as a promising processing method for exchange-spring magnetic materials in bulk form. Powder mixtures of Fe and SmCo5 are consolidated and deformed by HPT exhibiting sample dimensions of several millimetres, being essential for bulky magnetic applications. The structural evolution during HPT deformation of Fe-SmCo5 compounds at room- and elevated- temperatures of chemical compositions consisting of 87, 47, 24 and 10 wt.% Fe is studied and microstructurally analysed. Electron microscopy and synchrotron X-ray diffraction reveal a dual-phase nanostructured composite for the as-deformed samples with grain refinement after HPT deformation. SQUID magnetometry measurements show hysteresis curves of an exchange coupled nanocomposite at room temperature, while for low temperatures a decoupling of Fe and SmCo5 is observed. Furthermore, exchange interactions between the hard- and soft-magnetic phase can explain a shift of the hysteresis curve. Strong emphasis is devoted to the correlation between the magnetic properties and the evolving nano-structure during HPT deformation, which is conducted for a 1:1 composition ratio of Fe to SmCo5. SQUID magnetometry measurements show an increasing saturation magnetisation for increasing strain γ and a maximum of the coercive field strength at a shear strain of γ = 75. View Full-Text
Keywords: nanostructured composite; Fe-SmCo5 heterostructure; exchange coupled; spring magnet; high pressure torsion; nucleation field; bulk dimensions nanostructured composite; Fe-SmCo5 heterostructure; exchange coupled; spring magnet; high pressure torsion; nucleation field; bulk dimensions
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MDPI and ACS Style

Weissitsch, L.; Stückler, M.; Wurster, S.; Knoll, P.; Krenn, H.; Pippan, R.; Bachmaier, A. Strain Induced Anisotropic Magnetic Behaviour and Exchange Coupling Effect in Fe-SmCo5 Permanent Magnets Generated by High Pressure Torsion. Crystals 2020, 10, 1026. https://doi.org/10.3390/cryst10111026

AMA Style

Weissitsch L, Stückler M, Wurster S, Knoll P, Krenn H, Pippan R, Bachmaier A. Strain Induced Anisotropic Magnetic Behaviour and Exchange Coupling Effect in Fe-SmCo5 Permanent Magnets Generated by High Pressure Torsion. Crystals. 2020; 10(11):1026. https://doi.org/10.3390/cryst10111026

Chicago/Turabian Style

Weissitsch, Lukas, Martin Stückler, Stefan Wurster, Peter Knoll, Heinz Krenn, Reinhard Pippan, and Andrea Bachmaier. 2020. "Strain Induced Anisotropic Magnetic Behaviour and Exchange Coupling Effect in Fe-SmCo5 Permanent Magnets Generated by High Pressure Torsion" Crystals 10, no. 11: 1026. https://doi.org/10.3390/cryst10111026

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