温度对ID畴壁内VBL解体临界面内场的影响  

Influence of Temperature and In-plane Fields on Vertical Bloch Lines in the Walls of the First Kind of Dumbbell Domains

作　　者：刘素平[1] 徐建萍[1] 聂向富[1] 

机构地区：[1]河北师范大学物理学院,河北石家庄050016

出　　处：《河北师范大学学报（自然科学版）》2004年第1期32-34,38,共4页Journal of Hebei Normal University：Natural Science

基　　金：国家自然科学基金资助项目(10274018);河北省自然科学基金资助项目(100147)

摘　　要：实验研究了温度和面内场共同作用下,液相外延石榴石磁泡膜中第I类哑铃畴(ID)畴壁内垂直布洛赫线(VBL)的稳定性.发现,从室温到T0范围内的任一不同温度下,ID畴壁中VBL的解体都存在一临界面内场范围[H(1)ipip(T)<Hip<H(2)ip(T),H(2)ip(T)],当Hip<H(1)ip(T)时,ID畴壁中VBL数目不变;当H(1)(T)时,ID畴壁中VBL逐渐丢失,且随面内场Hip的增大,VBL丢失得越来越多;当Hip>H(2)ip(T)时,VBL完全丢失.面内场范围[H(1)ip(T)也分别随温度的升高ip(T),H(2)ip(T)]随温度的升高而减小,其中H(1)ip(T),H(2)而变小,并分别在T(1)0和T0处减小为0.The stability of vertical Bloch lines (VBLs) in the domain walls of the first kind of dumbbell domains(IDs) in garnet bubble films under both temperature and in-plane field is investigated experimentally.It is found that there exists a critical in-plane field range of the VBLs annihilation in the walls of IDs at various temperatures from room temperature to T_0.When H_(ip)≤H^((1))_(ip),the number of VBLs in the domain walls of IDs keeps stable,when H_(ip)<H^((1))_(ip)<H^((2))_(ip),the VBLs in the domain walls of IDs will annihilate gradually and the number of annihilations increases with the increasing of H_(ip),when H_(ip)≥H^((2))_(ip),the VBLs in the domain walls of IDs annihilate completely.The range decreases with the increase in temperature,while the values of H^((1))_(ip) and H^((2))_(ip) decrease too,and reach zero at T^((1))_0,T_0 respectively.

关 键 词：垂直布洛赫线 VBL 临界面内场 临界温度 第1类哑铃畴 ID畴壁 液相外延石榴石磁泡膜 

分 类 号：O484.43[理学—固体物理]