Magnetic Property of CoTbNi Ternary Alloy Thin Films
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ORIGINAL PAPER
Magnetic Property of CoTbNi Ternary Alloy Thin Films R. K. Basumatary 1 & Aakansha 2 & B. Basumatary 3 & B. Brahma 1,4 & R. Hussain 4 & S. Ravi 2 & R. Brahma 1 & S. K. Srivastava 4 Received: 4 April 2020 / Accepted: 10 June 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The structure and magnetic property of as prepared and post-annealed thin films of CoTbNi ternary alloy have been investigated. (Co0.85Tb0.15)1-xNix alloy thin films with x = (0.54, 0.63, 0.72, 0.81) were grown on Si-substrate by co-sputtering of Ni element and Co0.85Tb0.15 alloy using dc magnetron sputtering. These films have been crystallized in amorphous form, as confirmed by Xray diffraction (XRD) measurement. The magnetization versus field measurements shows that these films exhibit room temperature ferromagnetism. The magnetic properties of these alloy films have a strong dependency on the Ni concentrations. It is observed that the saturation magnetization and coercivity of these alloy thin films decreases with increase of Ni content of the films. One of the striking features was the observation of perpendicular magnetic anisotropy (PMA) for x = 0.63 and 0.72 thin films. However, the observed PMA disappears upon post-annealing of the films. The M-T measurement shows that the ferromagnetic transition temperatures of these materials are much higher than the room temperature. Keywords Thin film . Ternary CoTbNi alloy . Co-Tb alloy . Perpendicular magnetic anisotropy
1 Introduction Since last couple of decades, there have been intense investigations on the magnetic properties of amorphous rare-earthtransition metal (RE-TM) thin films due to their potential applications in various practical devices such as spintronic and perpendicular magnetic recording devices. The RE-TM alloys are usually ferrimagnetic with the moments of RE (Gd, Tb, Ho, etc.) and TM (Fe, Co, Ni, etc.) aligned antiparallel due to the exchange interaction between f and d electrons [1, 2]. The magnetic properties of these alloy films can be tuned by the addition of under- and/or over-layers, such as Cu, Al, Ag,
* S. K. Srivastava [email protected] 1
Department of Physics, Bodoland University, Kokrajhar 783370, India
2
Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, India
3
Physical Science Division, Institute of Advanced Study in Science and Technology, Guwahati 781035, India
4
Department of Physics, Central Institute of Technology Kokrajhar, Kokrajhar 783370, India
TiN, Ta, etc. which also can serve as protective layer for oxidation and coercivity enhancement [3–7]. The other way to modify the magnetic properties of RE-TM alloy films is by varying film composition, film thickness, sputtering conditions, and microstructure [8–10]. Recently, the discovery of perpendicular magnetic anisotropy (PMA) in amorphous Co-Tb-based alloys have been revisited by the investigators due to their wide variety of collinear magnetic ordering such as ferrimagnetism as well as non-collinear magnetic o
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