TY - JOUR
T1 - Microwave generation on geometrically constrained magnetic wall
T2 - Effect of twist angle
AU - Matsushita, Katsuyoshi
AU - Sato, Jun
AU - Imamura, Hiroshi
AU - Sasaki, Munetaka
PY - 2010/9/1
Y1 - 2010/9/1
N2 - We studied the current-induced magnetization dynamics of geometrically constrained magnetic walls (GCMWs) with twist angles of 90-180°, in order to examine their possibility as microwave generators using the effects of the twist angles. We numerically solved the Landau-Lifshitz-Gilbert equation with a spin-transfer torque term and found that the magnetic structures of GCMWs with certain twist angles oscillate between the Bloch and Néel walls (OBN) with microwave frequency, even though the twist angle is not 180°. We also found the critical twist angle below which the oscillation of the magnetic structure is inhibited. We showed that the oscillation frequency shows a hysteresis when we vary the twist angle of a GCMW or the corresponding applied magnetic field. Then, we also discussed the microwave generation induced by the periodic-deformation dynamics of GCMWs in the OBN.
AB - We studied the current-induced magnetization dynamics of geometrically constrained magnetic walls (GCMWs) with twist angles of 90-180°, in order to examine their possibility as microwave generators using the effects of the twist angles. We numerically solved the Landau-Lifshitz-Gilbert equation with a spin-transfer torque term and found that the magnetic structures of GCMWs with certain twist angles oscillate between the Bloch and Néel walls (OBN) with microwave frequency, even though the twist angle is not 180°. We also found the critical twist angle below which the oscillation of the magnetic structure is inhibited. We showed that the oscillation frequency shows a hysteresis when we vary the twist angle of a GCMW or the corresponding applied magnetic field. Then, we also discussed the microwave generation induced by the periodic-deformation dynamics of GCMWs in the OBN.
KW - Current-induced magnetization dynamics
KW - Geometrically constrained magnetic wall
KW - Microwave generation
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U2 - 10.1143/JPSJ.79.093801
DO - 10.1143/JPSJ.79.093801
M3 - Article
AN - SCOPUS:77957091245
VL - 79
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 9
M1 - 093801
ER -