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采用一维原子链模型研究了反铁磁耦合的硬磁/软磁/硬磁三层膜体系的反磁化过程. 研究结果表明,当考虑了软磁层的磁晶各向异性能后,软磁层厚度和界面交换耦合强度的改变都有可能导致软磁层的交换弹性反磁化过程由可逆过程转变为不可逆过程. 对软磁层很薄的体系,其反磁化过程是典型的可逆交换弹性反磁化过程. 然而,当软磁层厚度超过某一临界厚度tc时,反磁化过程转变为不可逆的交换弹性反磁化过程. 软磁-硬磁界面交换耦合强度Ash对反磁化行为也有很大的影响. 对于软磁层厚度小于临界厚度tc的体系,也存在一个临界界面交换耦合强度Ashc. 当Ash大于Ashc时,软磁层的反磁化过程是可逆的交换弹性反磁化过程;而当Ash小于Ashc时,这一过程变为不可逆. 给出了体系的可逆与不可逆交换弹性反磁化过程随软磁层厚度和界面交换耦合强度变化的磁相图. 同时还研究了偏转场随软磁层厚度的变化关系.The demagnetization processes of antiferromagnetically exchange-coupled hard-soft-hard trilayer structures are studied based on the one-dimensional atomic chain model. It is found that when the magnetic anisotropy of soft layer is taken into account, the change of the soft layer thickness or the interfacial exchange coupling strength may lead to a transition from the reversible exchange-spring process to the irreversible process. For the trilayer structures with very thin soft layer, the demagnetization process exhibits typical reversible magnetic exchange-spring behavior. However as the thickness of soft layer increases, there appears a crossover point tc, after which the process becomes irreversible. There occurs also a critical interfacial exchange constant Ashc, above which the exchange-spring process is reversible. When AshAshc, the irreversible exchange-spring process is realized. The phase diagrams of reversible and irreversible exchange-spring process are mapped in the plane of the interfacial exchange coupling Ash and soft layer thickness Ns. The dependences of the bending field on the soft layer thickness for different interfacial exchange couplings are numerically examined.
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Keywords:
- antiferromagnetically exchange coupled trilayer /
- exchange-spring process /
- demagnetization mechanism /
- magnetic phase diagram
[1] Kneller E F, Hawig R 1991 IEEE Trans. Magn. 27 3588
[2] Skomski R, Coey J M D 1993 Phys. Rev. B 48 15812
[3] Fullerton E E, Jiang J S, Grimsditch M, Sowers C H, Bader S D 1998 Phys. Rev. B 58 12193
[4] Sawicki M, Bowden G J, de Groot P A J, Rainford B D, Beaujour J M L 2000 Phys. Rev. B 62 5817
[5] Choi Y, Jiang J S, Ding Y, Rosenberg R A, Pearson J E, Bader S D, Zambano A, Murakami M 2007 Phys. Rev. B 75 104432
[6] McCord J, Henry Y, Hauet T, Montaigne F, Fullerton E E, Mangin S 2008 Phys. Rev. B 78 094417
[7] Xian C H, Zhao G P, Zhang Q X, Xu J S 2009 Acta Phys. Sin. 58 3509(in Chinese)[鲜承伟、 赵国平、 张庆香、 徐劲松 2009 58 3509]
[8] Leineweber T, Kronmüller H 1997 Phys. Stat. Sol. 201 291
[9] Asti G, Solzi M, Ghidini M, Neri F M 2004 Phys. Rev. B 69 174401
[10] Goto E, Hayashi N, Miyashita T, Nakagawa K 1965 J. Appl. Phys. 36 2951
[11] Bowden G J, Beaujour J M L, Gordeev S, de Groot P A J, Rainford B D, Sawicki M 2000 J. Phys.: Condens. Matter 12 9335
[12] Guo G H, Zhang G F, Song S Y, Wang D W, Bowden G J, de Groot P A J 2008 Appl. Phys. Lett. 93 102505
[13] Mangin S, Bellouard C, Andrieu S, Montaigne F, Ohresser P, Brookes N B, Barbara B 2004 Phys. Rev. B 70 014401
[14] Mangin S, Thomas L, Montaigne F, Lin W, Hauet T, Henry Y 2009 Phys. Rev. B 80 224424
[15] Feng Q, Huang Z G, Du Y W 2003 Acta Phys. Sin. 52 2906(in Chinese) [冯 倩、 黄志高、 都有为 2003 52 2906]
[16] Fitzsimmons M R, Park S, Dumesnil K, Dufour C, Pynn R, Borchers J A, Rhyne J J, Mangin Ph 2006 Phys. Rev. B 73 134413
[17] Guslienko K Yu, Chubykalo-Fesenko O, Mryasov O, Chantrell R, Weller D 2004 Phys. Rev. B 70 104405
[18] Zhang A G, Wang Y J, Han X F, Zhan W S 2004 Chin. Phys. 13 2153
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[1] Kneller E F, Hawig R 1991 IEEE Trans. Magn. 27 3588
[2] Skomski R, Coey J M D 1993 Phys. Rev. B 48 15812
[3] Fullerton E E, Jiang J S, Grimsditch M, Sowers C H, Bader S D 1998 Phys. Rev. B 58 12193
[4] Sawicki M, Bowden G J, de Groot P A J, Rainford B D, Beaujour J M L 2000 Phys. Rev. B 62 5817
[5] Choi Y, Jiang J S, Ding Y, Rosenberg R A, Pearson J E, Bader S D, Zambano A, Murakami M 2007 Phys. Rev. B 75 104432
[6] McCord J, Henry Y, Hauet T, Montaigne F, Fullerton E E, Mangin S 2008 Phys. Rev. B 78 094417
[7] Xian C H, Zhao G P, Zhang Q X, Xu J S 2009 Acta Phys. Sin. 58 3509(in Chinese)[鲜承伟、 赵国平、 张庆香、 徐劲松 2009 58 3509]
[8] Leineweber T, Kronmüller H 1997 Phys. Stat. Sol. 201 291
[9] Asti G, Solzi M, Ghidini M, Neri F M 2004 Phys. Rev. B 69 174401
[10] Goto E, Hayashi N, Miyashita T, Nakagawa K 1965 J. Appl. Phys. 36 2951
[11] Bowden G J, Beaujour J M L, Gordeev S, de Groot P A J, Rainford B D, Sawicki M 2000 J. Phys.: Condens. Matter 12 9335
[12] Guo G H, Zhang G F, Song S Y, Wang D W, Bowden G J, de Groot P A J 2008 Appl. Phys. Lett. 93 102505
[13] Mangin S, Bellouard C, Andrieu S, Montaigne F, Ohresser P, Brookes N B, Barbara B 2004 Phys. Rev. B 70 014401
[14] Mangin S, Thomas L, Montaigne F, Lin W, Hauet T, Henry Y 2009 Phys. Rev. B 80 224424
[15] Feng Q, Huang Z G, Du Y W 2003 Acta Phys. Sin. 52 2906(in Chinese) [冯 倩、 黄志高、 都有为 2003 52 2906]
[16] Fitzsimmons M R, Park S, Dumesnil K, Dufour C, Pynn R, Borchers J A, Rhyne J J, Mangin Ph 2006 Phys. Rev. B 73 134413
[17] Guslienko K Yu, Chubykalo-Fesenko O, Mryasov O, Chantrell R, Weller D 2004 Phys. Rev. B 70 104405
[18] Zhang A G, Wang Y J, Han X F, Zhan W S 2004 Chin. Phys. 13 2153
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