| 摘要 |
PROBLEM TO BE SOLVED: To increase magnetization, and hence ensure a hard magnetic thin film and an exchange spring magnet both being excellent in performance and both having a maximum energy product, by exchangeably coupling a hard magnetic layer and a soft magnetic layer, and forming a laminate film where there are alternately laminated a specific range thickness hard magnetic layer and a specific range soft magnetic layer. SOLUTION: There are exchangeably coupled a hard magnetic layer which uses as a main structure of any one of crystal structures of the types of CaCu5, TbCu7, Gd2Co7, or Ce2Ni7, ThMn12, Th2Zn17 or Th2Ni17, or a composite thereof and a soft magnetic layer using a soft magnetic material where the magnitude of magnetization is 1.3T at room temperature, and hereby a laminate film is ensured where a 1nm to 700nm hard magnetic layer and a 1nm to 700nm thick soft magnetic layer are alternately laminated. As a result, there are ensured a hard magnetic thin film and an exchange spring magnet which are excellent in performance and which has greater magnetization and a maximum energy product. |
