Motion of magnetic domain walls and vortices in epitaxial magnetite microstructures

Mandziak, Anna; Aristu, Miguel A.; Prieto, J. E.; Foerster, Michael; Aballe, Lucía; Figuera, Juan de la

doi:10.1016/j.apsusc.2023.157838

Cited by 5 publications

(4 citation statements)

References 32 publications

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“…According to Equation (3), the eddy-current loss gradually increases with decreasing resistivity. As the CIPs doping amount increases, the pores formed by CIPs agglomeration reduce the flow area of eddy currents in the SMCs, limiting the eddy-current operation among the soft magnetic powder particles, and the upward trend of eddy-current loss is restrained [29,30]. In addition, the residual loss is relatively low and its change mechanism differs from those of the hysteresis and eddy-current losses (Figure 10d).…”

Section: Resultsmentioning

confidence: 99%

Investigating the Effect of Carbonyl Iron Powder Doping on the Microstructure and Magnetic Properties of Soft Magnetic Composites

Liu,

Wang,

et al. 2024

Magnetochemistry

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This study proposes the thermal decomposition of salt compounds and doping of carbonyl iron powders (CIPs) to optimize the preparation of an insulating layer through the solid-phase interface reaction. First, (Fe–Si–Cr + CIPs)/ZnSO4 composite powders were synthesized using the hydrothermal method and (Fe–Si–Cr + CIPs)/ZnO·SiO2·Cr2O3 SMCs with a ZnO·SiO2·Cr2O3 composite insulation layer were prepared through heat treatment and cold pressing. The effect of the CIP doping content on the microstructure and magnetic properties of the (Fe–Si–Cr + CIPs)/ZnO·SiO2·Cr2O3 SMCs were then investigated. During the heat treatment, ZnSO4 decomposed into solid ZnO and gaseous SO2 and O2. The O2 drives the solid-phase reaction, prompting the migration of nonmagnetic Si and Cr atoms from the interior of the Fe–Si–Cr soft magnetic powder to the surface insulation layer, finally forming the ZnO·SiO2·Cr2O3 insulation layer. The doped CIPs also show good plasticity during the coating process, combining with the coating layer to fill the internal pores of SMCs. Moreover, as the particles are small with a high surface area, they increase the number of reaction sites for ZnSO4 decomposition and facilitate the growth of the composite insulation layer, promoting its uniform distribution on the surfaces of the soft magnetic powders and CIPs. The lattice mismatch between the insulation layer and soft magnetic powder is reduced while the magnetic-phase content is increased, allowing the effective doping of CIPs sin the insulation layer. The magnetic properties of SMCs can be precisely regulated by changing the doping amount of CIPs. Unlike other insulating layer–preparation strategies based on the interfacial solid-phase reaction, the proposed method exploits the high plasticity and specific surface area of CIPs and removes the lattice mismatch between the insulation layer and soft magnetic powder.

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Section: Resultsmentioning

confidence: 99%

Investigating the Effect of Carbonyl Iron Powder Doping on the Microstructure and Magnetic Properties of Soft Magnetic Composites

Liu,

Wang,

et al. 2024

Magnetochemistry

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“…Nanometer thick magnetite films on Ru(0001) have a reported coercive field around 30 mT. 37 Our own research on magnetite islands grown on bulk Ru crystals has shown that fields of a few mT are enough to modify the shape anisotropy patterns in a reversible way 38 and that fields of 40−50 mT are needed to modify their magnetization patterns in remanence. 12 The image in Figure 4b corresponds to the domains observed after applying a magnetic field of 45 mT, 12,22 while the next panel shows the domains observed after reversing the applied magnetic field.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…This is attributed in part to the lack of antiphase boundaries, as each of the islands arises form a single nucleus and the growth process is stopped before coalescence. In the case of magnetite, magnetic closure domains dictated by shape anisotropy have been observed and modified through the application of external magnetic fields. , …”

Section: Introductionmentioning

confidence: 99%

“…In the case of magnetite, magnetic closure domains dictated by shape anisotropy have been observed 4 and modified through the application of external magnetic fields. 12,38 The use of single-crystal bulk Ru(0001) substrates can be substituted by thin Ru films deposited on insulating substrates, as proved by the growth of ceria 13 and graphene 14 on such films. We have recently characterized those thin films as substrates 15 and found them to be of a quality comparable to that of bulk single crystals.…”

Section: ■ Introductionmentioning

confidence: 99%

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A Platform for Addressing Individual Magnetite Islands Grown Epitaxially on Ru(0001) and Manipulating Their Magnetic Domains

Ruiz-Gómez

M.²,

Fernández-González

et al. 2023

Crystal Growth & Design

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We have grown high-quality magnetite micrometric islands on ruthenium stripes on sapphire through a combination of magnetron sputtering (Ru film), high-temperature molecular beam epitaxy (oxide islands), and optical lithography. The samples have been characterized by atomic force microscopy, Raman spectroscopy, X-ray absorption and magnetic circular dichroism in a photoemission microscope. The magnetic domains on the magnetite islands can be modified by the application of current pulses through the Ru stripes in combination with magnetic fields. The modification of the magnetic domains is explained by the Oersted field generated by the electrical current flowing through the stripes underneath the magnetite nanostructures. The fabrication method is applicable to a wide variety of rock salt and spinel oxides.

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Optimisation of the magnetic properties of soft-magnetic composites through an interfacial solid-phase reaction based on hot-pressing sintering and secondary-magnetic-phase addition

Wang,

Li,

et al. 2024

Ceramics International

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Motion of magnetic domain walls and vortices in epitaxial magnetite microstructures

Cited by 5 publications

References 32 publications

Investigating the Effect of Carbonyl Iron Powder Doping on the Microstructure and Magnetic Properties of Soft Magnetic Composites

Investigating the Effect of Carbonyl Iron Powder Doping on the Microstructure and Magnetic Properties of Soft Magnetic Composites

A Platform for Addressing Individual Magnetite Islands Grown Epitaxially on Ru(0001) and Manipulating Their Magnetic Domains

Optimisation of the magnetic properties of soft-magnetic composites through an interfacial solid-phase reaction based on hot-pressing sintering and secondary-magnetic-phase addition

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