title: Switching of magnetic easy-axis using crystal orientation for large perpendicular coercivity in CoFe2O4 thin film.
abstract: Perpendicular magnetization and precise control over the magnetic easy axis in magnetic thin film is necessary for a variety of applications, particularly in magnetic recording media. A strong (111) orientation is successfully achieved in the CoFe2O4 (CFO) thin film at relatively low substrate temperature of 100 °C, whereas the (311)-preferred randomly oriented CFO is prepared at room temperature by the DC magnetron sputtering technique. The oxygen-deficient porous CFO film after post-annealing gives rise to compressive strain perpendicular to the film surface, which induces large perpendicular coercivity. We observe the coercivity of 11.3 kOe in the 40-nm CFO thin film, which is the highest perpendicular coercivity ever achieved on an amorphous SiO2/Si substrate. The present approach can guide the systematic tuning of the magnetic easy axis and coercivity in the desired direction with respect to crystal orientation in the nanoscale regime. Importantly, this can be achieved on virtually any type of substrate.
authors.affiliation: Spin Device Technology Center, Faculty of Engineering, Shinshu University, Nagano 380-8553, Japan.
authors.forename: Sagar E
authors.initials: SE
authors.lastname: Shirsath
authors.affiliation: Spin Device Technology Center, Faculty of Engineering, Shinshu University, Nagano 380-8553, Japan.
authors.forename: Xiaoxi
authors.initials: X
authors.lastname: Liu
authors.affiliation: Spin Device Technology Center, Faculty of Engineering, Shinshu University, Nagano 380-8553, Japan.
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Yasukawa
authors.affiliation: School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2502, Australia.
authors.forename: Sean
authors.initials: S
authors.lastname: Li
authors.affiliation: Spin Device Technology Center, Faculty of Engineering, Shinshu University, Nagano 380-8553, Japan.
authors.forename: Akimitsu
authors.initials: A
authors.lastname: Morisako