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Angular dependence of switching field of magnetic recording particles

Sebt, A ; Sharif University of Technology | 2002

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  1. Type of Document: Article
  2. DOI: 10.1016/S0921-4526(02)00835-9
  3. Publisher: 2002
  4. Abstract:
  5. In a magnetic recording media, anisotropic particles are placed with different directions in the head field. The switching field, Hs of a particle at a certain direction is defined as the minimum field, which reverses its easy axis magnetization. To determine the position of magnetization transition in recording media, one needs the angular dependence of the switching field. To find this for a texture of anisotropic single domain particles, the acicular iron particles with 0.3 μm length have been grown in a magnetic field. Then, the textures of the particles have been oriented by another magnetic field. We have measured the remanent magnetization of samples mr(θ) and mr(H), respectively, as functions of angle and field by a VSM system. The easy axis distribution is obtained from mr(θ), then the distribution and mr(H) is used for determining the angular dependence of the switching field. Results show that Hs for small angles is <20% of the anisotropy field of the particles Hk. This difference from the Stoner-Wohlfarth model is explained by using particles interaction. © 2002 Elsevier Science B.V. All rights reserved
  6. Keywords:
  7. Easy axis distribution ; Fine magnetic particles ; Recording media ; Switching field
  8. Source: Physica B: Condensed Matter ; Volume 321, Issue 1-4 , 2002 , Pages 120-123 ; 09214526 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0921452602008359