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Domain-Wall Depinning Mechanism in Ferromagnetic Nanowires

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— 1 min read

Researchers from Seoul National University in Seoul, South Korea, have experimentally characterized the domain-wall depinning mechanism at notches of ferromagnetic nanowires with perpendicular magnetic anisotropy. Their study, published in IEEE Transactions on Magnetics, reveals that the depinning time is exponentially proportional to the strength of external magnetic field. The researchers used a time-resolved magneto-optical Kerr effect detection method to analyze the depinning mechanism.

Key Takeaways:

  • The domain-wall depinning mechanism at notches of ferromagnetic nanowires with perpendicular magnetic anisotropy was experimentally characterized by K.J. Kim and colleagues at Seoul National University.
  • The depinning time was found to be exponentially proportional to the strength of external magnetic field, according to a time-resolved magneto-optical Kerr effect detection method.
  • The depinning field and activation volume were quantitatively determined for several notches with different gap distances, and were found to be proportional to the inverse of the gap distance.
  • The researchers concluded that the sizeable extrinsic effect from geometric constrictions in the nanowires explained the observed depinning mechanism, rather than the intrinsic properties of the films.
  • The study was published in IEEE Transactions on Magnetics, a leading journal in the field of magnetics and nanotechnology.

Statistics:

  • The depinning time was found to be exponentially proportional to the strength of external magnetic field, with a power-law relationship observed.
  • The depinning field and activation volume were quantitatively determined for several notches with different gap distances, with a linear relationship observed between the gap distance and the depinning field/activation volume.
  • The study was published in IEEE Transactions on Magnetics, a journal with an impact factor of 1.836 (source: Journal Citation Reports).
  • The research was conducted by K.J. Kim and colleagues at Seoul National University, in collaboration with researchers at other institutions.

Sources:

  • K.J. Kim et al., "Depinning Field at Notches of Ferromagnetic Nanowires With Perpendicular Magnetic Anisotropy," IEEE Transactions on Magnetics, 2009;45(10 Sp. Iss):4056-4058.
  • Seoul National University, School Physics, Seoul 151742, South Korea (contact S.B. Choe for more information).
  • IEEE Transactions on Magnetics, Publisher contact information: IEEE-Institute Electrical Electronics Engineers Inc., 445 Hoes Lane, Piscataway, NJ 08855, USA.

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