期刊
CHEMOSENSORS
卷 10, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/chemosensors10060225
关键词
Heusler alloys; glass-coated microwires; magnetic properties; Curie temperature; X-ray diffraction
资金
- Spanish MCIU [PGC2018-099530-B-C31]
- EU [HORIZON-CL5-2021-D5-01-06]
- Government of the Basque Country [PUE_2021_1_0009]
- Elkartek (MINERVA) project
- Elkartek (ZE-KONP) project
- Elkartek (COMPONENS) project
- University of the Basque Country, under the scheme of Ayuda a Grupos Consolidados [GIU18/192]
- University of the Basque Country [COLAB20/15]
- Diputacion Foral de Gipuzkoa [2021-CIEN-000007-01]
In this study, Co2FeSi Heusler alloy glass-covered microwires with metallic nucleus and glass-coated layer were successfully fabricated. XRD analysis revealed a mixed structure of crystalline and amorphous phases in the metallic nucleus. Magnetic measurements demonstrated well-defined magnetic anisotropy and soft magnetic behavior. Additionally, a high Curie temperature and potential for high-temperature spintronic applications were reported.
In this work, we were able to produce Co2FeSi Heusler alloy glass-covered microwires with a metallic nucleus diameter of about 4.4 mu m and total sample diameter of about 17.6 mu m by the Taylor-Ulitovsky Technique. This low cost and single step fabrication process allowed the preparation of up to kilometers long glass-coated microwires starting from a few grams of high purity inexpensive elements (Co, Fe and Si), for a wide range of applications. From the X-ray diffraction, XRD, analysis of the metallic nucleus, it was shown that the structure consists of a mixture of crystalline and amorphous phases. The single and wide crystalline peak was attributed to a L2(1) crystalline structure (5.640 angstrom), with a possible B2 disorder. In addition, nanocrystalline structure with an average grain size, D-g = 17.8 nm, and crystalline phase content of about 52% was obtained. The magnetic measurements indicated a well-defined magnetic anisotropy for all ranges of temperature. Moreover, soft magnetic behavior was observed for the temperature measuring range of 5-1000 K. Strong dependence of the magnetic properties on the applied magnetic field and temperature was observed. Zero field cooling and field cooling magnetization curves showed large irreversibility magnetic behavior with a blocking temperature (T-B = 205 K). The in-plane magnetization remanence and coercivity showed quite different behavior with temperature, due to the existence of different magnetic phases induced from the internal stress created by the glass-coated layer. Moreover, a high Curie temperature was reported (T-c approximate to 1059 K), which predisposes this material to being a suitable candidate for high temperature spintronic applications.
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