• Title/Summary/Keyword: domain wall motion

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Magnetic Domain Walls at the Edges of Patterned NiO/NiFe Bilayers (패턴된 이중박막의 자구벽 특성조사)

  • Hwang, D.G.;Lee, S.S.
    • Journal of the Korean Magnetics Society
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    • v.13 no.4
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    • pp.176-181
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    • 2003

  • The magnetic domain walls at the edges of a large patterned and exchanged-biased NiO(10-60 nm)/NiFe(10 nm) bilayers and their motions with applied field were investigated by magnetic force microscopy. Three kinds of domain walls, namely, head-to-head zig-zag and tail-to-tail zig-zag Bloch walls and straight Neel walls were found at specific edges of the unidirectional biased NiO(30 nm)/NiFe(10 nm) bilayer having the exchange biasing field (H$\sub$ex/) of 21 Oe. No walls were observed for the strong exchange-biased bilayer (60 nm NiO, H$\sub$ex/ = 75 Oe), while the amplitude of the zig-zag domain increased with decreasing exchange biasing. This may be explained by mutual restraint between H$\sub$ex/ and the demagnetization field of edge. We similarly investigated the magnetization reversal process, the subsequent motion of the walls and identified the pinning and nucleation sites during reversal.

  • https://doi.org/10.4283/JKMS.2003.13.4.176 인용 PDF KSCI

Time-resolved Observation of Field-dependent Magnetization Reversal Behavior in Co/Pd Multilayer Film

  • Ryu, Kwang-Su;Lee, Kyeong-Dong;Choe, Sug-Bong;Shin, Sung-Chul
    • Journal of Magnetics
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    • v.8 no.3
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    • pp.108-112
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    • 2003

  • We report the experimental finding that there exists a transition of magnetization reversal process with varying the applied field in Co/Pd multilayer. We have measured the wall-motion speed V and the nucleation rate R during magnetization reversal via time-resolved direct domain observation, where the magnetization reversal process of Co/Pd multilayer is found to take a transition from thermal activation process to viscous process at the critical field of about 1.87 H$\_$C/ (coercivity). In the thermal activation regime, we find that the field dependences of two activation volumes for the wall-motion process and the nucleation process are different with each other, which reveals that the wall-motion and nucleation experience completely different interactions. In the viscous regime, we find that the wall-mobility is much smaller than a typical value for the sandwiched Co films, which implies that the Co/Pd interfaces in multilayer substantially contribute to the dynamic dissipation.

  • https://doi.org/10.4283/JMAG.2003.8.3.108 인용 PDF KSCI