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Low temperature magnetic behaviour of glass-covered magnetic microwires with gradient nanocrystalline microstructure

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Serrano, I. G. and Hernando Grande, Antonio and Marín, P. (2014) Low temperature magnetic behaviour of glass-covered magnetic microwires with gradient nanocrystalline microstructure. Journal of applied physics, 115 (3). ISSN 0021-8979

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Official URL: http://dx.doi.org/10.1063/1.4862540


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Abstract

Slow nanocrystallization driving dynamics can be affected by the combination of two factors: sample residual stresses and sample geometry. This effect is evidenced at the initial stages of nanocrystallization of amorphous CoFeSiBCuNb magnetic microwires. Transmission electron microscopy observations indicate how crystallization at temperatures between 730 and 780 K results in a graded microstructure where the crystallization at the surface skin of the microwire, which remains almost amorphous, differs from that of the middle, where elongated grains are observed, and inner regions. However, samples annealed at higher temperatures present a homogeneous microstructure. The effect of gradient microstructure on magnetic properties has been also analyzed and a loss of bistable magnetic behaviour at low temperatures, from that obtained in the amorphous and fully nanocrystallized sample, has been observed and ascribed to changes in sign of magnetostriction for measuring temperatures below 100 K.


Item Type:Article
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©2014 AIP Publishing LLC.
This work has been supported by the MEC of Spain (Consolider-Ingenio 2010 Contract Nos. CSD2007-0010 and MAT2009-14741-C02-01), (S2009 MAT 1726 and Projects TSI-020100-2011- 280, IPT-2011-0893-420000).

Uncontrolled Keywords:Amorphous-alloys; Crystallization; Wires; Magnetostriction; Ferromagnets; Dependence; Pressure; Ribbons
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:42207
Deposited On:22 Aug 2017 17:00
Last Modified:23 Aug 2017 07:29

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