共查询到15条相似文献,搜索用时 507 毫秒
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实验研究了温度对液相外延石榴石磁泡薄膜中条状普通硬磁畴壁内的垂直布洛赫线(VBL)链解体临界面内磁场区间的影响。发现存在一对特征温度T(1)0 和 T(2)0(前者比后者略低但均高于室温),在从室温到T(2)0的每个温度T下,使VBL逐渐消失的面内磁场Hip都分布于一个与T有关的区间[Hip(1)(T), Hip(2)(T)]内,称为临界面内磁场区间:Hip<Hip(1)(T)时,VBL链保持不变;Hip(1)(T)< Hip < Hip(2)(T)时,随着Hip的增加,越来越多的VBL消失;Hip > Hip(2)(T)时,所有VBL都消失。Hip(1)(T),Hip(2)(T)及Hip(2)(T)-Hip(1)(T)均随T的升高而下降,前二者分别于T(1)0 和 T(2)0降为零。比值Hip(2)(T)/Hip(1)(T)随T的升高而升高,在低温段(包括室温)升高缓慢且约为21/2,在T(1)0附近急剧升高且至T(1)0时趋于∞。对以上结果做了理论分析。
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Bao Shan Han 《Journal of magnetism and magnetic materials》1991,100(1-3):455-468
As a main micromagnetic structure of domain walls in garnet bubble films, vertical-Bloch-line (VBL) chains play an important role in the characteristics of hard domains. In the 1970s, their study progressed rapidly during the period in which bubble devices were developed. When ultra-high-density Bloch line memory (BLM) was proposed in 1983, VBL chain behavior again attracted attention. This review will introduce the early achivements focusing primarily on the results of the last decade. A convenient method of forming VBL chains, a new classification scheme of hard domains and the unsolved “number effect” of VBLs will be discussed. Various behaviors of VBL chains under static compression, and in-plane magnetic fields will also be presented. Finally, the temperature stability of VBL chains will be reported. 相似文献
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INFLUENCE OF IN-PLANE FIELD ON THE STABILITY OF VERTICAL BLOCH LINE CHAINS IN HARD DOMAINS OF GARNET BUBBLE FILMS 总被引:4,自引:0,他引:4
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The stability of vertical Bloch line (VBL) chains was statistically studied for all three types of bard domains in garnet bubble films subjected to an in-plane field Hip. With a set of integrate data taken from seven bubble samples and with two typical figures of a sample, four main features of the behavior of VBL chains subjected to Hip were summarized. 相似文献
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ANNIHILATION OF VERTICAL-BLOCH-LINE CHAINS IN THE WALLS OF THE SECOND KIND OF DUMBBELL DOMAINS SUBJECTED TO JOINT STATIC BIAS FIELD AND IN-PLANE FIELD
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Experiments were statistically carried out on the behavior of vertical-Bloch-line(VBL) chains in the walls of the second kind of dumbbell domains (IIDs) is garnet bubble films subjected to joint action of static bias field Hb and in-plane field Hip. The curves of the four critical in-plane fields, (Hip)IID-ID (Hip)IID-OHB (Hip)IID-SB and H'ip vs Hb were measured and explained. In particular, in terms of two series of IID photos, a new experimental manifestation of the unknown "number effect" of VBL chains was found. 相似文献
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Influence of Temperature on Equilibrium Separation Between Vertical Bloch Lines in OHBs in Garnet Bubble Films
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The diameters of the ordinary hard bubbles (OHBs) and soft bubbles in epitaxial garnet films are measured under the microscope at various temperatures. It is found that the bubble diameters of OHBs increase with temperature, and it is concluded that the equilibrium separation between two neighbouring vertical Bloch lines (VBLs) Seq is widened with increasing temperature. At the same time, the results can be understood simply as that there are more VBLs in the domain walls of the first dumbbell domains (IDs) than those in walls of OHBs at the same temperature. 相似文献
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M. Mirabal-Garcia P. Grünberg W. Zinn 《Journal of magnetism and magnetic materials》1982,28(3):313-318
An improved simple method for magneto-optical display of ferromagnetic domains by means of laser light is reported. As an example, characteristic domain patterns are presented and discussed, which develop during the magnetization reversal of ferromagnetic EuS-films grown epitaxially on silicon substrates. The critical field strength for domain nucleation, HK, the coercive field, Hc, the saturation field, Hs, and the direction and width of the domains have been studied as function of angle varied between the magnetical easy and hard axes of (110)- and (111)-EuS films, and as a function of temperature between 6 and 14.5 K. By extrapolating the linear decrease of H2K,cs vs. T to zero the Curie temperature of the (110)- and (111)-EuS films has been determined to (15.3±0.2) K and (14.5±0.2) K, respectively. 相似文献