INFLUENCE OF IN-PLANE FIELD ON THE CRITICAL TEMPERATURE FOR THE BREAKDOWN OF VERTICAL BLOCH LINE CHAINS
HAN BAO-SHAN (韩宝善), HUO SHU-GUO (霍素国)a, ZHANG HONG-YUAN (张宏愿), MENG GUANG-QING (孟广庆)
State Key Laboratory for Magnetism, Institute of Physics, Academia Sinica, Beijing 100080, China; a Department of Physics, Hebei Teachers University, Shijiazhuang 050016, China
Abstract The influence of in-plane field Hip on the critical temperature T0 for the breakdown of vertical Bloch line (VBL) chains of hard domains in garnet bubble films has been inves-tigated experimentally. It was found that T0 can be significantly reduced by the increase of Hip. Besides, the critical in-plane field H′ip for the breakdown of VBL chains was measured as a function of temperature T for the same sample. As a result, the correlation between these two critical parameters, T0 and H′ip, was found. By introducing an effective in-plane field (Hip)e, the positive definiteness of the system of VBL pairs with two-dimemsional magnetization distribution was analyzed, giving rise to a theoretical expression of H′ip(T): H′ip(T) =|4$\pi$MsQ(a0+a1Q +a2Q2+a3Q3+ a4Q4)|T(T0(Hip=0)), where ai are constants. It agrees well with the experiments.
Received: 01 December 1994
Accepted manuscript online:
PACS:
75.60.Ej
(Magnetization curves, hysteresis, Barkhausen and related effects)
(Magnetic properties of monolayers and thin films)
Fund: Project supported in part by the National Natural Science Foundation of China and by the National Science Foundation of Hebei Province.
Cite this article:
HAN BAO-SHAN (韩宝善), HUO SHU-GUO (霍素国), ZHANG HONG-YUAN (张宏愿), MENG GUANG-QING (孟广庆) INFLUENCE OF IN-PLANE FIELD ON THE CRITICAL TEMPERATURE FOR THE BREAKDOWN OF VERTICAL BLOCH LINE CHAINS 1996 Acta Physica Sinica (Overseas Edition) 5 120
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