Controlling the magnetic anisotropy of CoPt∕AlN multilayer films

Abstract

Roles of L10 ordering in controlling the magnetic anisotropy and coercivity of (111)-oriented CoPt ultrathin continuous layers in CoPt/AlN multilayer films

Magnetoelastically induced perpendicular magnetic anisotropy and perpendicular exchange bias of CoO/CoPt multilayer films

“…As is known, the in-plane stress is considered to be an important physical origin of PMA in FM/AFM multilayer films, which is so called magnetoelastically induced PMA [12,13]. In this paper, we find the PMA strength of FM layer also plays an important role on PEB at the FM/AFM interface and it is effective to control PEB of [CoO5nm/CoPt5nm] 5 …”

“…A few years later, PMA was also observed in Co/Au, Co/Pt and Co/Ru systems, of which the magnetic anisotropy could be enhanced by improving the interface quality [2][3][4]. Recently, AlN was used instead of noble metal layer to avoid interdiffusion and PMA was obtained in CoPt/ AlN and FePt/AlN systems after thermal annealing at temperatures up to 600°C [5,6]. In such multilayer films, it was considered that both interface anisotropy and magnetoelastic effect played important roles in promoting PMA.…”

“…During the past decades, multilayer films with perpendicular magnetic anisotropy (PMA) have been proposed in various configurations [1][2][3][4][5][6]. In 1985, Carcia firstly reported PMA for layered structure in Co/Pd system, and explained the mechanism responsible for PMA in terms of the interface anisotropy originated from the broken symmetry at the interface [1].…”

Curie temperatures of CoPt ultrathin continuous films

“…The island structure or particulate morphology makes it difficult to study the size effect on Curie temperature. In our previous work it has been found that CoPt thin layers in AlN/CoPt multilayer films remain continuous [22]. Subsequently Curie temperature of such CoPt continuous layers has been studied in the present work.…”

Magnetic Behavior of FePt/AlN Layered Structure

“…7) In our previous work, we tried to use nitride layers instead of the noble metal layers to avoid such diffusion and firstly reported PMA in magnetic alloy/nitride-CoPt/AlN layered structures. 8) The films undergo a gradually transition from inplane anisotropy to perpendicular anisotropy as the annealing temperatures increasing. Good consistence between anisotropy transition and in-plane stress change inside CoPt layers strongly implies the contribution from magneto-elastic anisotropy.…”