Domain wall propagation on nanometer scale: Coercivity of a single pinning center

Konstantin S. Novoselov, A. K. Geim, Dirk Van der Berg, Sergey V. Dubonos, Jan Kees Maan

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Nanometer-scale movements of domain walls in uniaxial garnet films have been studied by means of micromagnetization measurements using miniature gold and semiconductor Hall probes. The high spatial resolution is achieved due to low intrinsic noise of semiconductor ballistic Hall microprobes. At low (helium) temperatures, the domain walls are found to move by discrete jumps, which we attribute to pinning on isolated defects, and we were able to measure local hysteresis loops associated with pinning on individual pinning centers. The temperature dependence of the coercive field of a single pinning center allowed us to evaluate the characteristic energy and characteristic volume of the pinning center. At higher temperatures, the character of domain wall propagation changed, and walls were found to move not only by jumps between pinning centers but also via elastic bending.
    Original languageEnglish
    Pages (from-to)2583-2585
    Number of pages2
    JournalIeee Transactions on Magnetics
    Volume38
    Issue number5 I
    DOIs
    Publication statusPublished - Sept 2002

    Keywords

    • Hall effect devices
    • Magnetic domains
    • Magnetization reversal

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