Magnetic and Structural Properties of FePt-FeRh Exchange Spring Films for Thermally Assisted Magnetic Recording Media
- San Jose Research Center
- ORNL
Recently a novel media structure for thermally assisted magnetic recording was proposed consisting of a layer of FePt exchange coupled to a FeRh layer. The FePt forms a high magnetocrystalline anisotropy, high coercivity ferromagnetic layer. The FeRh layer is antiferromagnetic at room temperature, but upon heating above a transition temperature becomes ferromagnetic with a large magnetic moment and low magnetocrystalline anisotropy. The coupled ferromagnetic FePt and FeRh layers form an exchange-spring system significantly lowering the coercive field of the composite system compared to a single layer of FePt. This feature opens intriguing possibilities for media applications for thermally assisted magnetic recording where the ferromagnetic phase of FeRh is exploited to help write the media while the low-temperature antiferromagnetic phase supports the long-term stability. Here temperature-dependent structural and magnetic measurements of undoped and doped FeRh single layer and FePt-FeRh bilayer films are presented and the promises and challenges of the exchange spring media structure are discussed.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 978065
- Journal Information:
- IEEE Transactions on Magnetics, Vol. 40, Issue 4; ISSN 0018-9464
- Country of Publication:
- United States
- Language:
- English
Similar Records
Deposition temperature induced magnetic anisotropy variation in FePt-C soft/hard multilayer films
Ledge-type Co/L1{sub 0}-FePt exchange-coupled composites