Magnetization reversal of FePt based exchange coupled composite media

J. Wang, H. Sepehri-Amin, Y. K. Takahashi*, S. Okamoto, S. Kasai, J. Y. Kim, T. Schrefl, K. Hono


研究成果: Article査読

20 被引用数 (Scopus)


Microstructure and magnetic properties of L10-ordered FePt-C nanogranular films capped with A1-disordered FePt layers with various thicknesses were investigated. After the growth of 9.5 nm thick L10-FePt-C granular layer on a MgO(001) single crystalline substrate at a substrate temperature of Ts = 600 °C, FePt capping layers with thicknesses, tFePt, ranging from 2.7 to 8.6 nm were deposited at Ts = 400 °C. The coercivity of the L10-FePt-C/A1-FePt exchange coupled composite (ECC) media decreased from 4.9 to 1.4 T with increasing tFePt. Evaluation of energy barrier, Eb, using the Sharrock equation indicated no degradation of thermal barrier in spite of the large reduction in the coercivity. The switching field distribution of the ECC media is significantly reduced from 23% for the single layer FePt-C granular film to 8% for the ECC media with tFePt = 6.5 nm. Micromagnetic simulations showed the magnetization reversal of ECC media with tFePt = 2 nm capping layer occurs by the coherent rotation while domain wall pinning becomes dominant for tFePt ≥ 5 nm. The switching field distribution (SFD) of the ECC media is substantially decreased for tFePt = 2 nm. Low coercivity with high Eb and improved SFD observed from the ECC media makes them promising as high areal density recording media for both perpendicular magnetic recording (PMR) and heat assisted magnetic recording (HAMR).

ジャーナルActa Materialia
出版ステータスPublished - 2016 6月 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • ポリマーおよびプラスチック
  • 金属および合金


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