Reduction of magnetoelastic constant B2 in Fe thin films by nitrogen implantation, as determined by surface acoustic waves
Abstract
This article presents an original approach to both modify and measure the magnetoelastic coupling constant B2 in epitaxial nitrogen-implanted Fe thin films presenting the α′−Fe8N1−x phase. Once the magnetocrystalline anisotropy has been determined by standard techniques, we measure the field dependence of Rayleigh surface acoustic wave (SAW) velocity variations. The magnetoelastic coupling constant is extracted by fitting the field-angle dependence of these variations. Using the magnetic and magnetoelastic parameters thus determined, the variations in SAW velocity as a function of the external field seen in surface acoustic wave induced ferromagnetic resonance experiments can be accurately reproduced, both in pristine and nitrogen-implanted Fe thin films. This ensemble of results confirms a reduction by almost half of the magnetoelastic coupling under doping level 2 ×1016 N2/cm2.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (10)
A. Sharma
L. Christienne
Sorbonne Université, CNRS, Institut des Nanosciences de Paris, INSP , F-75005 Paris,
F. Millo
Sorbonne Université, CNRS, Institut des Nanosciences de Paris, INSP , F-75005 Paris,
M. Eddrief
Sorbonne Université, CNRS, Institut des Nanosciences de Paris, INSP , F-75005 Paris,
E. Dandeu
Sorbonne Université, CNRS, Institut des Nanosciences de Paris, INSP , F-75005 Paris,
J.-Y. Duquesne
Sorbonne Université, CNRS, Institut des Nanosciences de Paris, INSP , F-75005 Paris,
C. Gourdon
Sorbonne Université, CNRS, Institut des Nanosciences de Paris, INSP , F-75005 Paris,
L. Thevenard
Sorbonne Université, CNRS, Institut des Nanosciences de Paris, INSP , F-75005 Paris,
P. Rovillain
Sorbonne Université, CNRS, Institut des Nanosciences de Paris, INSP , F-75005 Paris,
M. Marangolo
Sorbonne Université, CNRS, Institut des Nanosciences de Paris, INSP , F-75005 Paris,