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RISS 인기검색어
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- 저자 : Hiroyuki Awano (검색결과 2 건)
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Size Effect of the Domain-Wall Magnetoreristance in TbFeCo Wires
Do Bang,Hiroyuki Awano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We studied the domain-wall (DW)-induced magnetoresistance (MR) effect in TbFeCo wires witha thickness of 18 nm and different widths at room temperature. In wide (up to 10-µm-width) wires,small MR values that weakly depended on the number of DWs inside the wires, were obtained. This could be attributed to multi-domain structures that reduced the spin asymmetry in the wire. For all wires, the MR values strongly depended on the bias current. In a narrow (0.8-µm-width)wire with a single DW structure, large MR values of up to 8% were observed at a low bias currentand depended on the DW structure inside the TbFeCo wires. On the other hand, the MR valueswere greatly reduced at large bias currents, which induced magnon and phonon scattering effects. The contribution of the single DW resistivity to the MR effect was found to be large for a narrowwire due to the large spin asymmetry of conduction electrons through the DWs. The well-definedand controllable number of DWs inside magnetic wires is expected to obtain high and multi-levelMR values as well as high potentials for future magnetic devices.
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Do Bang,Pham Van Thach,Hiroyuki Awano,Hyunsoo Yang 한국물리학회 2020 Current Applied Physics Vol.20 No.2
We demonstrated domain wall (DW)-induced anomalous magnetoresistance (MR) generated in asymmetric and symmetric ferrimagnetic Tb/Co multilayered, and Tb–Co alloyed wires. The extraordinary Hall effect (EHE)- induced circulating currents in the vicinity of DWs between longitudinal voltage probes are assigned to the anomalous MR. A large anomalous MR ~1.5% was obtained in the asymmetric Tb/Co multilayered wire. The large MR can be attributed to an addition of spin Hall current with a long coherence length from an adjacent Pt layer. These results open new possibilities for the use of ferrimagnetic multilayered wires beyond multi-function devices.
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