Archivio Istituzionale della RicercaTwo set of polycrystalline MnBi bulk samples, as-annealed and compacted powders, with different grain size, were prepared through powder metallurgy. Coercivity mechanisms were investigated by Kronmüller plot analysis, evaluating α and Neff parameters, which take into account the effect of microstructure. The temperature dependence of coercivity of the as-annealed sample (α= 0.31) is compatible with pinning-type mechanisms, while that of the compacted powders (α= 0.41) indicates nucleation-type processes. Irreversible effects of temperature dependence of coercivity have been investigated.
Study of the temperature dependence of coercivity in MnBi / Curcio, Carmen; Olivetti, Elena Sonia; Martino, Luca; Kuepferling, Michaela; Basso, Vittorio. - In: PHYSICS PROCEDIA. - ISSN 1875-3892. - STAMPA. - 75:(2015), pp. 1230-1237. (Intervento presentato al convegno ICM2015 tenutosi a Barcellona (Spagna) nel 5-11/07/2015) [10.1016/j.phpro.2015.12.135].
Study of the temperature dependence of coercivity in MnBi
CURCIO, CARMEN;OLIVETTI, Elena Sonia;
2015
Abstract
Two set of polycrystalline MnBi bulk samples, as-annealed and compacted powders, with different grain size, were prepared through powder metallurgy. Coercivity mechanisms were investigated by Kronmüller plot analysis, evaluating α and Neff parameters, which take into account the effect of microstructure. The temperature dependence of coercivity of the as-annealed sample (α= 0.31) is compatible with pinning-type mechanisms, while that of the compacted powders (α= 0.41) indicates nucleation-type processes. Irreversible effects of temperature dependence of coercivity have been investigated.
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https://hdl.handle.net/11583/2657643
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