Anomalous magnetic behavior in half-metallic Heusler Co2FeSi alloy glass-coated microwires with high Curie temperature

Salaheldeen, Mohamed; García-Gómez, Alfonso; Corte-León, Paula; Ipatov, M.; Zhukova, V.; González, J.; Zhukov, А.

doi:10.1016/j.jallcom.2022.166379

Cited by 21 publications

(43 citation statements)

References 53 publications

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“…in the as-prepared sample two filliped points at 255 K and 55 K are observed, where the coercivity tendency with temperature is changing. While, the annealed sample shows one filliped point at T = 155 K. The unusual behavior of the coercivity with temperature have been reported previously in in other Heusler-based glass coating microwires [30,31,35]. In addition, the Mr of annealed sample with the temperature show a sharp drop in its values compare to the as-prepared sample as illustrated in Figure 3b.…”

Section: Magnetic Propertiessupporting

confidence: 78%

“…As shown in Figure 1, a noticeable changing in the structure characterization is observed. Firstly, both diffractograms display a wide halo at 2θ ≈ 23º, related to the contribution of amorphous glass coating as reported in our previous works [30,31,35]. The as-prepared diffractogram shows strong single XRD peak at 2θ ≈ 46º as a (220) reflection peak.…”

Section: Edx Spectrumsupporting

confidence: 72%

“…Then, using the EDX/SEM setup as described in our earlier study, we evaluated the chemical composition. [30,31]. After validating the chemical composition, we prepared the glass-coated microwire using the Taylor-Ulitovsky.…”

Section: Methodsmentioning

confidence: 99%

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Elucidation of the Strong Effect of the Annealing and the Magnetic Field on the Magnetic Properties of Ni2-based Heusler Microwires

Salaheldeen¹,

Wederni²,

Ipatov³

et al. 2022

Preprint

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We studied the effect of annealing and the applied magnetic field from 50 Oe to 20 kOe on the magneto-structural behavior of Ni2FeSi-based Heusler microwires fabricated by using Taylor-Ulitovsky technique. Using the XRD analysis, a strong effect of annealing, manifested as the development of the crystallization process, was observed. The average grain size and crystalline phase content of annealed sample increase from 21.3 nm and 34 % to 32.8 nm and 79%, respectively, as-compared to the as-prepared one. In addition, upon annealing phase transforms into a monoclinic martensitic structure with modulation 10M were observed, which cannot be found in the as-prepared sample. Concerning the magnetic properties, both samples show ferromagnetic behavior below and above the room temperature, where the Curie temperature of Ni2FeSi is higher than room temperature. The induced secondary phases have a noticeable effect on the magnetic behavior of the annealed sample, where a high normalized saturation magnetization (NMs) and low normalized reduced remenance (Mr = M/M5K), compared to the as- prepared have been detected. Additionally, the coercivity of annealed sample shows one flipping point at 155 K where it behavior with temperature is changed. Meanwhile, the as-prepared sample show two flipped point at 205 K and 55 K. A mismatch between field cooling (FC) and field heating (FH) magnetization curves with temperature has been detected for annealed sample at low applied magnetic field. In addition the FC and FH curves shows different slopes with variation the temperature and the magnetic field. By increasing the external magnetic field higher than 200 Oe and up to 20 kOe a gradual changing in the magnetic behavior has been detected, where the mismatch and different slopes disappeared at applying magnetic field about 20 kOe. The difference in magnetic and structure behavior of Ni2FeSi microwires sample is discussed considering the effect of induced internal stresses by the presence of a glass coating and the recrystallization and stresses relaxation upon annealing.

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Section: Magnetic Propertiessupporting

confidence: 78%

Section: Edx Spectrumsupporting

confidence: 72%

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Elucidation of the Strong Effect of the Annealing and the Magnetic Field on the Magnetic Properties of Ni2-based Heusler Microwires

Salaheldeen¹,

Wederni²,

Ipatov³

et al. 2022

Preprint

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“…In the current work, we present an attempt to obtain Co2MnGe glass-coated microwires. The fabrication method choice is due to the interesting magneto-structural behavior of glass-coated microwires from Heusler alloys as well as functional properties of glass-coated microwires, such as superior mechanical properties, insulating, thin and flexible glass-coating and thin dimensionality [10][11][12][13][14][15][16][17][18][19]. Accordingly, we manufactured Co2MnGe glass-coated microwires using the Taylor-Ulitovsky process described in details elsewhere [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Accordingly, we manufactured Co2MnGe glass-coated microwires using the Taylor-Ulitovsky process described in details elsewhere [12,13]. The Taylor-Ulitovsky technique, known since the 1960s [20], is one of the fabrications recently used to produce Heusler alloys glass-coated microwires [10][11][12][14][15][16][17][18][19]. The fundamental advantage of this low-cost technology is that it enables the manufacturing of thin and long (a few kilometers long) microwires with an extended diameters range (d-values from 0.1 to 100 µ m) at high speeds (up to a few hundred meters per minute) [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Magneto-Structural Investigation of High Ordered (L21 Structure) Co2MnGe Microwires

Salaheldeen¹,

Wederni²,

Ipatov³

et al. 2023

Preprint

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We used the Taylor-Ulitovsky Technique to prepare nanocrystalline Co2MnGe Heusler alloy glass-coated microwires with a metallic nucleus diameter of 18 ± 0.1 µm and a total diameter of 27.2 ± 0.1 µm. Magnetic and structural studies were carried out to determine the fundamental magneto-structural characteristics of Co2MnGe glass-coated microwires. XRD revealed a well-defined nanocrystalline structure with average grain size about 63 nm, lattice parameter a = 5.62 and a unique mixture of L21 and B2 phases. The magnetization curves for field cooling and field heating (FC-FH) demonstrate a considerable dependence on the applied magnetic field, ranging from 50 Oe to 20 kOe. Internal stresses, originated by the production process, resulted in various magnetic phases, which were responsible for the notable difference of field cooling (FC) and field heating (FH) curves on magnetization dependence versus temperature. Furthermore, the ferromagnetic behavior and expected high Curie temperature together with high degree of L21 ordered makes it a promising candidate for many applications.

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First-principles calculations to investigate huge magneto-optic Kerr effect and thermoelectric properties of NdBiPt Heuslerene

Sartipi

Elahi

Hantehzadeh

et al. 2023

Optik

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Anomalous magnetic behavior in half-metallic Heusler Co2FeSi alloy glass-coated microwires with high Curie temperature

Cited by 21 publications

References 53 publications

Elucidation of the Strong Effect of the Annealing and the Magnetic Field on the Magnetic Properties of Ni<sub>2</sub>-based Heusler Microwires

Elucidation of the Strong Effect of the Annealing and the Magnetic Field on the Magnetic Properties of Ni<sub>2</sub>-based Heusler Microwires

Preparation and Magneto-Structural Investigation of High Ordered (<em>L2<sub>1</sub></em> Structure) Co2MnGe Microwires

First-principles calculations to investigate huge magneto-optic Kerr effect and thermoelectric properties of NdBiPt Heuslerene

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