Thermodynamic and DFT modeling in quaternary Co-based Heusler phase space: Understanding the interplay between disorder, bonding, and magnetism

Romaka, V.V.; Omar, Ahmad; Löser, W.; Büchner, B.; Wurmehl, S.

doi:10.1016/j.commatsci.2021.111089

Cited by 4 publications

(1 citation statement)

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“…Generally, the L2 1 structure determines the physical properties of Co 2 -based Heusler alloys [13,14]. Although the L2 1 structure is a highly ordered structure, the existence of disordered structure phases, such as B2, A2 and DO3, may arise during the fabrication process of alloys [9,15]. Therefore, Co 2 -based Heusler alloys are very sensitive to fabrication techniques.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Magneto-Structural Properties of Co2-Based Heusler Alloy Glass-Coated Microwires with High Curie Temperature

et al. 2022

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In this work, we were able to produce Co2FeSi Heusler alloy glass-covered microwires with a metallic nucleus diameter of about 4,4 µm and total sample diameter of about 17,6 μm 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 L21 crystalline structure (5.640 Å), with a possible B2 disorder. In addition, nanocrystalline structure with an average grain size, Dg = 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 (TB= 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 (Tc ≈ 1059 K), which predisposes this material to being a suitable candidate for high temperature spintronic applications.

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Section: Introductionmentioning

confidence: 99%