hcp Co薄膜のスピン波分散定数の決定とD値問題解決への試み

概要

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There is a considerable discrepancy in reported values of the spin wave stiffness (D) constant for hep Co crystals (490-580 meV Å^2) and thin films (430-460 meV Å^2). Although this discrepancy was already recognized in the 1980s, it remained as the D-value problem of hep Co for almost twenty years. We present our recent attempts toward solving the D-value problem. We performed Brillouin light scattering (BLS) and magnetization studies using a same (10-10) epitaxial film. We determined a complete set of the magnetic constants, including a value of D = 427±43 meV Å^2, from the BLS study, and we reproduced the temperature development of magnetization by applying spin wave theory with the BLS magnetic constants. Through our analyses and literature retrievals, we found several problems existing in data analysis of magnetization and neutron studies of single crystals. We discuss how and why the D-value problem occurred.
社団法人日本磁気学会の論文
2004-10-01