TY - JOUR
T1 - The dependence of vortex oscillation frequency on small in-plane magnetic fields in spin-valve nanocontacts
AU - Eggeling, M.
AU - Dimopoulos, T.
AU - Heer, R.
AU - Bruckl, H.
N1 - cited By 2
PY - 2012
Y1 - 2012
N2 - In this work we investigate the magnetic field dependence of the precession frequency of vortex states in spin-valve nanocontacts with an amorphous CoFeB free layer and an artificial antiferromagnet as polarizer. The nanocontacts have radii between 70 and 90 nm. We show that the excitation frequency in these devices responds to small, in-plane magnetic fields along the easy and hard axis directions. The characteristics of the frequency response depend on the generated magnetic configuration under the nanocontact. This, in turn, results from the combined effect of the applied magnetic field and the current-generated Oersted field. Taking also into account the relative large nanocontact radii, a variety of vortex excitation modes can arise with distinctive frequency versus field responses, some of which could be considered for magnetic field sensing applications. © 1965-2012 IEEE.
AB - In this work we investigate the magnetic field dependence of the precession frequency of vortex states in spin-valve nanocontacts with an amorphous CoFeB free layer and an artificial antiferromagnet as polarizer. The nanocontacts have radii between 70 and 90 nm. We show that the excitation frequency in these devices responds to small, in-plane magnetic fields along the easy and hard axis directions. The characteristics of the frequency response depend on the generated magnetic configuration under the nanocontact. This, in turn, results from the combined effect of the applied magnetic field and the current-generated Oersted field. Taking also into account the relative large nanocontact radii, a variety of vortex excitation modes can arise with distinctive frequency versus field responses, some of which could be considered for magnetic field sensing applications. © 1965-2012 IEEE.
KW - Amorphous CoFeB
KW - Antiferromagnets
KW - Applied magnetic fields
KW - Combined effect
KW - Excitation frequency
KW - Free layers
KW - In-plane magnetic fields
KW - Magnetic configuration
KW - Magnetic field dependences
KW - Magnetic field sensing
KW - Nano contacts
KW - Oscillation frequency
KW - Precession frequency
KW - Spin-valves
KW - Vortex excitation
KW - Vortex state
KW - Antiferromagnetic materials
KW - Cobalt compounds
KW - Magnetic fields
KW - Vortex flow
KW - Frequency response
U2 - 10.1109/TMAG.2012.2201456
DO - 10.1109/TMAG.2012.2201456
M3 - Article
SN - 0018-9464
VL - 48
SP - 3814
EP - 3817
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 11
ER -