Structural Dependent Ferromagnetic-Nonmagnetic Phase Change in FePtRu Films

Herein, we studied correlations between crystal structures and magnetic properties of FePt1−xRux films. At room temperature, the chemical disordered films with and exhibited ferromagnetic properties and paramagnetic properties, respectively. Curie temperature of the disordered film with was 200 K. In contrast, the ordered films had ferromagnetic properties in a wider range of with the magnetic easy-axis perpendicular to the film plane. For , with the ordered structure, the films had high magnetization and high uniaxial magnetic anisotropy of over 107 erg cm−3. For = 0.60–0.70 with the ordered structure, a temperature-dependent magnetic phase transition appeared, and magnetization reached its maximum value at around 200 K. Using this material system, we proposed a nanopatterning method involving a ferromagnetic-paramagnetic phase change due to the ordered-disordered structural transformation.

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