Related references
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M. Salaheldeen et al.
Summary: In this study, it was shown that the magnetic and structural properties of Ni2FeSi glass-coated microwires are strongly affected by the annealing conditions. Annealing increased the crystalline phase content and changed the hysteresis loop shape. The annealed samples also exhibited higher coercive and magnetic anisotropy fields, while the as-prepared samples showed reduced remanence. The temperature dependence of the coercivity was anomalous for both as-prepared and annealed samples. These results indicate the sensitivity of Heusler-based glass-coated microwires to temperature and annealing conditions, suggesting potential applications in spintronic devices and sensing.
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Summary: Co2FeSi glass-coated microwires with different aspect ratios were studied, showing significant changes in microstructure and magnetic properties. XRD analysis revealed a transition from amorphous to crystalline structure as the aspect ratio increased. By increasing the aspect ratio, the squareness and coercivity of the microwires were notably enhanced. It was found that the microstructure strongly affects the magnetic reversal process, and the thermomagnetic curves showed different levels of irreversibility depending on the aspect ratio. This study demonstrates the ability to control the microstructure and magnetic properties of Co2FeSi glass-coated microwires by adjusting their geometrical properties.
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Summary: In this study, we investigated the effect of annealing on the magnetic behavior of Co2MnSi-based Heusler microwires. The annealing temperature was set at 1023 K for 2 hours, and annealing above this temperature would damage the glass coating. Both annealed and as-prepared samples showed strong in-plane magnetocrystalline anisotropy, and the coercivity of the annealed sample was four times higher than that of the as-prepared sample. Interestingly, both samples exhibited stable coercivity behavior with temperature. The annealed sample displayed sharp irreversible magnetic behavior at a blocking temperature of 220 K, while the as-prepared sample had a blocking temperature of 150 K. The unusual and irreversible magnetic behavior was attributed to the internal mechanical stress induced during fabrication and the stress relaxation caused by annealing.
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Mohamed Salaheldeen et al.
Summary: The Taylor-Ulitovsky technique was used to prepare nanocrystalline Co2MnGe Heusler alloy glass-coated microwires with specific magneto-structural characteristics. XRD analysis revealed a defined nanocrystalline structure with unique phases. The magnetic properties were influenced by internal stresses and showed anomalous behavior compared to other glass-coated microwires. These microwires have potential applications due to their ferromagnetic behavior and high order.
Review
Physics, Applied
Arcady Zhukov et al.
Summary: This article provides an overview of the development of low-cost magnetic microwires with insulating, flexible, and biocompatible glass coating. The magnetic properties of these microwires can be tuned, and they exhibit excellent magnetic softness and fast domain wall propagation. Various methods, such as heat treatment and stress annealing, can be used to further improve their magnetic properties. The article also discusses the influence of structure and chemical composition on the magnetic and transport properties of crystalline microwires. The potential applications and future developments of magnetic microwires are briefly discussed.
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Summary: The interest in magnetic nanostructures with perpendicular magnetic anisotropy and exchange bias has grown due to their potential applications in spintronic devices. In this study, a nanofabrication process was used to induce a significant out-of-plane component of the magnetic easy axis and exchange bias in CoO/Co multilayers deposited on nanostructured alumina templates. The increase in exchange bias and coercivity in the nanostructured films compared to non-patterned films indicates a change in magnetic anisotropy from in-plane to out-of-plane.
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Chemistry, Physical
M. Salaheldeen et al.
Summary: In this study, Co2FeSi Heusler alloy glass-covered microwires were successfully fabricated and their magnetic properties were investigated. The annealing conditions were found to have a strong influence on the magnetic behavior of the samples. Anomalous magnetic behavior was observed in the annealed samples, and the structural properties were analyzed. These findings are important for the design of devices based on magnetization switching.
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(2022)
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Summary: This article presents a new Co2FeSi glass-coated microwire with a nanocrystalline structure obtained using the Taylor-Ulitovsky technique. The annealing process significantly increased the size of the nanograins and resulted in the observation of perfect square hysteresis loops. The annealed samples exhibited dramatic magnetic behavior at low temperatures and showed critical temperature points where the magnetic behavior changed. The anomalous magnetic behavior can be attributed to the coexistence of ordered and disordered phases induced by annealing conditions. The presence of the glass coating influenced the magnetization behavior and mechanical properties of the Co2FeSi microwires.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Chemical
Mohamed Salaheldeen et al.
Summary: In this work, nanocrystalline Co2MnSi Heusler alloy glass-coated microwires were successfully fabricated for the first time. The microwires showed well-defined crystalline structures and unique magnetic behavior at a wide range of temperature and magnetic fields, making them promising for magnetic sensing and spintronic applications.
Review
Materials Science, Multidisciplinary
Kelvin Elphick et al.
Summary: Heusler alloys are theoretically predicted to potentially become half-metals at room temperature. These alloys have advantages such as good lattice matching with major substrates, high Curie temperature above RT, and controllability for spin density of states at the Fermi energy level. They are categorized into half- and full-Heusler alloys based on crystalline structures, with discussions both experimentally and theoretically.
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