Effect of Fe under layer in ultrathin FeRh films

Heat assisted magnetic recording (HAMR) is a likely candidate for achieving higher areal densities in future magnetic recording technologies [1]. HAMR employs the use of a laser and near field optical transducer to locally heat the medium, such that the magnetic field required for writing is reduced. This is required when high magnetocrystalline materials, such as L1₀ ordered FePt, are used to provide long term thermal stability in high density recording applications, thus providing a way to satisfy the media trilemma [2] and circumvent the super-paramagnetic limit.