Open AccessStabilisation of tetragonal FeCo structure with high magnetic anisotropy by the addition of V and N elements
Author(s) -
Takashi Hasegawa,
Takuya Niibori,
Yusuke Takemasa,
Mitsuaki Oikawa
Publication year - 2019
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/s41598-019-41825-7
Subject(s) - tetragonal crystal system , materials science , condensed matter physics , magnet , magnetic anisotropy , epitaxy , anisotropy , amorphous solid , lattice (music) , thin film , saturation (graph theory) , magnetization , crystal structure , crystallography , nanotechnology , magnetic field , chemistry , electrical engineering , optics , physics , mathematics , layer (electronics) , quantum mechanics , combinatorics , acoustics , engineering
The development of magnetic materials with high saturation magnetization ( M s ) and uniaxial magnetic anisotropy ( K u ) is required for the realisation of high-performance permanent magnets capable of reducing the power consumption of motors and data storage devices. Although FeCo-based materials with the body-centred cubic structure (bcc) exhibit the highest M s values among various transition metal alloys, their low K u magnitudes makes them unsuitable for permanent magnets. Recent first-principles calculations and experimental studies revealed that the epitaxial FeCo thin films with the body-centred tetragonal (bct) structure and thicknesses of several nanometres exhibited K u values of 10 6 J·m −3 due to epitaxial stress, which required further stabilisation. In this work, the FeCo lattice stabilised via VN addition were characterised by high K u magnitudes exceeding 10 6 J·m −3 . The obtained bct structure remained stable even for the films with thicknesses of 100 nm deposited on an amorphous substrate, suggesting its possible use in bulk systems.