Surface Magnetization Reversal of Wiegand Wire Measured by the Magneto-Optical Kerr Effect

Nakamura, Tomoaki; Tanaka, Hiroki; Horiuchi, Tomofumi; Yamada, Tsutomu; Takemura, Yasushi

doi:10.3390/ma14185417

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…Typically, the magnetic properties of magnetic materials are expressed by measuring the major or minor hysteresis loops. Prior research has already investigated the magnetization reversal process of magnetic materials in detail by the magneto-optical Kerr effect (MOKE) [ 15 , 16 ]. Nonetheless, the information on the interactions or coercivity distributions cannot be feasibly obtained from the major hysteresis loop or the minor loop, as the MOKE can only evaluate the magnetization process on the surface of magnetic materials.…”

Section: Methodsmentioning

confidence: 99%

“…If the sample comprises thin films or nanowires of a thin structure, the surface magnetization is similar to the surface layer or the whole sample. Nakamura et al showed that the surface magnetization of a Wiegand wire measured by MOKE is completely different from that of the whole layer or soft layer near the surface region [ 15 ]. Different magnetization at the surface is possible for bulk material, as well as a Wiegand wire of sub millimeter material.…”

Section: Methodsmentioning

confidence: 99%

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Magnetic Interactions in Wiegand Wires Evaluated by First-Order Reversal Curves

Sha

Yang²,

Song³

et al. 2022

Materials

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Wiegand wires exhibit a unique fast magnetization reversal feature in the soft layer that is accompanied by a large Barkhausen jump, which is also known as the Wiegand effect. However, the magnetic structure and interaction in Wiegand wires cannot be evaluated by conventional magnetization hysteresis curves. We analyzed the magnetic properties of Wiegand wires at various lengths by measuring the first-order reversal curves (FORCs) and by evaluating the FORC diagram from a series of FORCs. In particular, we used a FeCoV Wiegand wire with a magnetic soft outer layer, an intermediate layer, and a hard core. The magnetization of the various layers in the wire could be identified from the FORC diagrams. Furthermore, based on the interaction between multiple layers, the positive and negative polarity of the FORC distribution was clarified.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Magnetic Interactions in Wiegand Wires Evaluated by First-Order Reversal Curves

Sha

Yang²,

Song³

et al. 2022

Materials

Self Cite

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“…A magnetic field camera based on the Faraday effect was used to directly observe magnetization reversal in Wiegand wires [17]. The magneto-optical Kerr effect was used to measure the magnetization on the surface of a Wiegand wire [18]. The magnetization of the various layers in the Wiegand wire can be identified using first-order reversal curve (FORC) diagrams [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Magnetization of Wiegand Wires with Varying Diameters and Analysis of Their Magnetic Structure via Hysteresis Loops

et al. 2023

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Wiegand wires are unique ferromagnetic materials that display rapid magnetization reversal and a large Barkhausen jump under an applied field. This stable reversal can be used to induce a periodic pulse voltage in a pickup coil wrapped around the Wiegand wire. To unlock the full potential of Wiegand wires for magnetic sensors and devices, the magnetic structure and magnetization state of the Wiegand wire must be fully elucidated. In this study, hysteresis loops were used to reveal the magnetic structure of Wiegand wires. Wiegand wires of different diameters magnetized under different applied magnetic field strengths were analyzed in detail. Our results show that Wiegand wires 0.06 mm in diameter are composed solely of a hard magnetic core. Wiegand wires above 0.10 mm in diameter have a hard magnetic core, a middle layer, and a soft layer that decreases in thickness but increases in coercivity as the wire diameter decreases. Then, theoretical models were built to predict the magnetic structure of Wiegand wires under an applied field for the first time. The magnetization process of Wiegand wires with different diameters under different applied magnetic fields was also analyzed.

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