Fabrication of TbFeCo alloy films with tunable perpendicular coercivity evaluated by extraordinary Hall effect measureme
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Fabrication of TbFeCo alloy films with tunable perpendicular coercivity evaluated by extraordinary Hall effect measurements Ke Wang1,* 1
, Yongming Tang1, Xiaopeng Xiao1, Zhan Xu1, and Jian Liu1
State Key Laboratory of Nuclear Resources and Environment, School of Mechanical and Electronic Engineering, East China University of Technology, Nanchang 330013, China
Received: 13 August 2020
ABSTRACT
Accepted: 21 October 2020
Rare-earth transition metal (RE-TM) TbFeCo alloy films with adjustable perpendicular switching field and anisotropy are desirable for the applications in high-density spintronic devices. A series of TbFeCo alloy films are fabricated by sputtering a composite target method. The perpendicular magnetic properties of the ferrimagnetic TbFeCo films are investigated by Extraordinary Hall effect (EHE) measurements. With increasing either sputtering power or gas flow rate film composition shifting from FeCo-rich to Tb-rich side is observed and the orientation of magnetic easy axis changing from in-plane, tilted to out-of-plane direction is witnessed. Pronounced change in magnetic properties particularly the coercivity of TbFeCo films is demonstrated, in line with the increased Tb-toFeCo ratio of the alloy films. It shows TbFeCo films with desirable coercivity can be achieved by proper combination of sputtering power and flow rate. Our work provides an efficient way in tuning the PMA of the sputtered TbFeCo films during the growth and may be used as guidance for designing TbFeCo-based spintronic devices.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction Rare-earth transition metal (RE-TM) alloy films have received considerable attention for their wide range of applications such as ultrafast magnetism, spintronics, magneto-optical isolator, magnonics [1–4]. Among them, ternary TbFeCo alloy films with strong perpendicular magnetic anisotropy (PMA), the
conventional magnetic/magneto-optical recording media are currently attracting increasing interest for the applications in high-density low-current spintronic devices, logic memories and skyrmion devices [5–11]. At room temperature rare-earth Tb and transition metal FeCo materials are paramagnetic and ferromagnetic, respectively. In the ternary TbFeCo alloy films, the rare-earth Tb sublattice is
Handling Editor: Catalin Croitoru.
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05487-5
J Mater Sci
antiferromagnetically coupled to the transition metal FeCo sublattice, which are displayed in antiparallel manner [12]. Hence, magnetic compensation phenomenon may happen. At the magnetic compensation point of the ferrimagnetic alloy the opposite magnetic moments of Tb and FeCo sublattices cancel out each other below the Curie temperature (Tc), where the film loses magnetic properties [13]. Accordingly, the net magnetization of the ferrimagnetic alloy film is zero at the magnetic compensation point. When Tb concentration in the TbFeCo alloy film exceeds compensation compo
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