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Effect of thermal annealing on nitrogen implanted epitaxial Fe films
Kong Hyeonjun,Kim Gowoon,Lee Joonhyuk,Cho Jinhyung,Jeen Hyoungjeen 한국물리학회 2021 Current Applied Physics Vol.24 No.-
Nitridated iron is a promising material for potential applications in permanent magnets. Recent work on stabilization of nitridated iron in a foil form through nitrogen ion implantation and annealing motivates to study effect of thermal annealing on the surface of nitrogen-implanted iron. In this work, we show effect of annealing on chemical state and magnetism of nitrogen implanted epitaxial iron films. It is observed that nitrogen in the lattices only stays at the lower temperatures than 450 ◦C. In addition, significant reduction and lattice modification are taken placed, when the film is annealed at 450 ◦C. The increases of saturation magnetization and coercivity, where it is annealed at 450 ◦C, are likely to be triggered by reduction of oxygen contents at the surface and thinning of Fe2O3.
Thickness Dependence on the Magnetism in Mo-Capped Epitaxial Fe Films
Hyeonjun Kong,Eun-Young Ahn,Gowoon Kim,Sangkyun Ryu,Sungkyun Park,Hyoungjeen Jeen,Tae-Yeol Jeon,Younghak Kim,Jin Hyung Cho 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.5
When magnetic metal films are oxidized, in many cases, their saturation magnetization values decrease. The importance of high magnetization is well-known because it is directly related to the maximum energy product. Thus, prevention of oxidation in magnetic metal films via capping is important not only for studying the magnetism in magnetic metal films but also for developing new packaging technology for such films. In this research, we successfully grow epitaxial (110) Fe lms on (0001) Al2O3 substrates by using radio-frequency (RF) magnetron sputtering. We capped 10-nm-thick Mo layers on the Fe films to prevent oxidation. By varying the thickness of the films, we systematically observed the changes in both the coercivity and the saturation magnetization. Especially, when the film's thickness was below 8.5 nm, the coercivity of the film started to decrease. We believe the drastic change in the coercivity appeared in the Fe films when the film's thickness approached the critical domain size for a magnetic domain transition.