Nd-Fe-B films with perpendicular magnetic anisotropy and extremely large room temperature coercivity

• Main Authors: Ma, Chuang, Xia, Jing, Zhang, Xichao, Zhou, Yan, Morisako, Akimitsu, Piramanayagam, S. N., Liu, Xiaoxi
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2020
• Subjects: Science::Physics; Nd-Fe-B Thin Films; Perpendicular Magnetic Anisotropy
• Online Access: https://hdl.handle.net/10356/140712
• Institution: Nanyang Technological University

Nd-Fe-B films with perpendicular magnetic anisotropy are important for various applications. Most common process to prepare Nd-Fe-B thin films with perpendicular magnetic anisotropy is the heteroepitaxy process. Here, Nd-Fe-B thin films with perpendicular magnetic anisotropy were prepared by a two-step process. Amorphous and magnetically soft thin films were first deposited. Crystallized, magnetic hard thin films were obtained by rapid thermal annealing of the as-deposited films. A clear correlation between perpendicular magnetic anisotropy of annealed state and the domain configuration in the as-deposited state was noticed. Films prepared without substrate heating, with additions of Tb show perpendicular coercivity which is larger than 24 kOe.