TY - JOUR
T1 - Dependence of exchange coupling interaction on micromagnetic constants in hard/soft magnetic bilayer systems
AU - Zambano, A. J.
AU - Oguchi, H.
AU - Takeuchi, I.
AU - Choi, Y.
AU - Jiang, J. S.
AU - Liu, J. P.
AU - Lofland, S. E.
AU - Josell, D.
AU - Bendersky, L. A.
PY - 2007/4/30
Y1 - 2007/4/30
N2 - To elucidate the dependence of exchange coupling behavior of hard/soft magnetic bilayer systems on various micromagnetic constants, the coupling length (λ) and the nucleation field (HN) were systematically measured on five thin-film libraries made of soft magnetic/hard magnetic bilayers. Hysteresis loops of CoPt Fex Co1-x (0≤x≤1), CoPt Ni, CoPt Fe, Sm2 Co7 (Fe,Co, or Ni), and Sm2 Co7 Ni were measured using a magneto-optical Kerr effect setup. The one-dimensional model proposed by Leineweber and Kronmüller [J. Magn. Magn. Mater. 176, 145 (1997)] and micromagnetic simulations were used to interpret the behavior of λ and HN obtained by the high-throughput investigation. We found that the dominant factors determining λ and HN are the hard layer magnetic constants and the saturation magnetization (M) of the soft layer. HN and λ display a direct correlation with the domain-wall width of the hard layer and have an anticorrelation with M of the soft layers. They were found to not be substantially dependent on exchange stiffness (A) and anisotropy (K) constants within the group of soft layer materials studied here.
AB - To elucidate the dependence of exchange coupling behavior of hard/soft magnetic bilayer systems on various micromagnetic constants, the coupling length (λ) and the nucleation field (HN) were systematically measured on five thin-film libraries made of soft magnetic/hard magnetic bilayers. Hysteresis loops of CoPt Fex Co1-x (0≤x≤1), CoPt Ni, CoPt Fe, Sm2 Co7 (Fe,Co, or Ni), and Sm2 Co7 Ni were measured using a magneto-optical Kerr effect setup. The one-dimensional model proposed by Leineweber and Kronmüller [J. Magn. Magn. Mater. 176, 145 (1997)] and micromagnetic simulations were used to interpret the behavior of λ and HN obtained by the high-throughput investigation. We found that the dominant factors determining λ and HN are the hard layer magnetic constants and the saturation magnetization (M) of the soft layer. HN and λ display a direct correlation with the domain-wall width of the hard layer and have an anticorrelation with M of the soft layers. They were found to not be substantially dependent on exchange stiffness (A) and anisotropy (K) constants within the group of soft layer materials studied here.
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U2 - 10.1103/PhysRevB.75.144429
DO - 10.1103/PhysRevB.75.144429
M3 - Article
AN - SCOPUS:34247571893
VL - 75
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 14
M1 - 144429
ER -