摘要
首先推出了铁磁晶体在弱外场作用下定态磁化参量,用斜率比较法分析了直接影响磁化取向的参量-平均场的取值情况,讨论了弱外场对定态磁化参量的影响机制,结果发现:①在弱外场较小时,系统与无外场时的情况类似,也有两个稳定取向和一个不稳定取向;如弱外场约大于自旋相互作用,则系统只有一个沿外场方向的稳定取向;②在外场比较弱的情况下,平均场可表示为外场的线性关系;③当平均场取下值点时,所有的N+和N-随弱外场变化的两条曲线相交于坐标轴的左边,磁化强度比的零点左移,外施磁场越大,交点越趋近于A点;当平均场取上值点时,所有的N+和N-随弱外场变化的两条曲线相交于坐标轴的右边,磁化强度比的零点右移,外施磁场越大,交点越趋近于A点。
First,Steady state magnetizing parameter of ferromagnetism crystal under the role of weak extra magnetic field is given, method of slope comparison is used to analysis that take value condition of parameteraverage magnetic field of weak extra magnetic under directly affect , Influence mechanism of weak extra magnetic field for steady state magnetizing parameter is discussed, Result is showed： ①When weak extra magnetic is than less, The condition of system and do not have extra magnetic field is similar, It is have two steady orientations and a instability orientation; If weak extra magnetic is bigger than spin interaction a little, System have one only along the steady orientation of extra magnetic direction;②under the condition of more weak extra magnetic, The linear relation that can express average magnetic field for extra magnetic field; ③When average magnetic field take the point of value downward ,Two curves of N＋ and N- with weak extra magnetic to change all intersect in the left side of reference axis, Zero point left move of magnetization strength, The more extra magnetic is big, The more point of intersect approach A ; When average magnetic field take the point of value upward , Two curves of N＋ and N- with weak extra magnetic to change all intersect in the right side of reference axis, Zero point right move of magnetization strength, The more extra magnetic is big, The more point of intersect approach A.
出处
《原子与分子物理学报》
CAS
CSCD
北大核心
2005年第3期556-562,共7页
Journal of Atomic and Molecular Physics
基金
涪陵师范学院重点学科资助课题(批准号:2003148)
涪陵师范学院科研处资助课题
关键词
弱外场沟
铁磁晶体
磁化取向
平均场
Weak extra magnetic
Ferromagnetism crystal
Weak extra magnetic
Average magnetic field
