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采用热分解法制备了分散程度高且平均晶粒尺寸为20 nm的CoFe2O4和MnFe2O4 复合介质.低温磁化曲线测量显示,制备的复合介质具有软-硬磁交换弹性耦合效应, 且合成温度以及软磁和硬磁相的成分比例对磁交换弹性耦合的强度有很大的影响. 变温磁测量显示,温度为20 K时,复合纳米介质的表面自旋冻结效应导致饱和磁化强度显著增加. Henkel测量显示,对分散的CoFe2O4和MnFe2O4复合介质, 磁偶极相互作用占主导作用.
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关键词:
- 热分解法 /
- 软-硬磁交换弹性耦合效应 /
- 表面自旋冻结效应 /
- Henkel
Highly dispersed granular nano-composite material of CoFe2O4 and MnFe2O4 with an average size of 20 nm is synthesized through thermal decomposition. The soft-hard magnet exchange-spring effect is observed in magnetization measurements at low temperatures, and is found to be strongly affected by the temperature of the reaction and the composition ratio between soft and hard magnetic phases. Magnetization measurements at different temperatures show that at 20 K, the saturation magnetization increases significantly, which is attributed to the freezing of the spin-glass like state at the surface of the nano-composite material. A Henkel Plot measurement on our sample shows that for the dispersed composite material of CoFe2O4 and MnFe2O4, the dipole interaction is dominant among magnetic interactions.-
Keywords:
- thermal decomposition /
- soft-hard magnet exchange-spring effect /
- freezing effect of surface spins /
- Henkel
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[13] Hamada N, Mishima C, Mitarati H, Honkura Y 2003 IEEE. Trans. Magn. 5 2953
[14] Mamoru O 2000 Mater. Sci. Eng. A 287 183
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[18] Vázquez-Vázquez C, López-Quintela M A, Buján-Núñez M C, Rivas J 2011 J. Nanopart Res. 13 1663
[19] Henkel O 1964 Phys. Status Solidi 7 919
[20] García-Otero J, Porto M, Rivas J 2000 J. Appl. Phys. 87 7376
[21] Stoner E C, Wohlfarth E P 1948 Philos. Trans. R. Soc. London Ser. A 240 599
[22] Balaji G, Wilde G, Weissmüller J, Gajbhiye N S, Sankaranarayanan V K 2004 Phys. Stat. Sol. B 241 1589
[23] Zhang Y, Liu Y, Fei C L, Yang Z H, Lu Z H, Xiong R, Yin D, Shi J 2012 J. Appl. Phys. 108 084312
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[1] Kneller E F, Hawig R 1991 IEEE Trans. Magn. 27 3588
[2] Skumryev V, Stoyanov S, Zhang Y, Hadjipanayis G, Givord D, Nogués J 2003 Nature 423 850
[3] Boyen H G, Kstle G, Zrn G, Herzog T, Weigl F, Ziemann P, Mayer O, Jerome C, Mller M, Spatz P, Garnier M, Oelhafen P 2003 Adv. Funct. Mater. 13 359
[4] Zeng H, Li L, Wang Z L, Liu J P, Sun S 2004 Nano Lett. 4 187
[5] Li J, Zeng H, Sun S, Liu J P, Wang Z L 2004 J. Phys. Chem. B 108 14005
[6] Gao R W, Feng W C, Liu H Q, Wang B, Chen W 2003 J. Appl. Phys. 94 664
[7] Cui W B, Liu W, Gong W J, Liu X H, Guo S, Yang F, Wang Z H, Zhang Z D 2012 J. Appl. Phys. 111 07B503
[8] Donnell K O, Coey J M D 1997 J. Appl. Phys. 81 6310
[9] Soares J M, Cabral F A O, de Araújo A H, Machado F L A 2011 Appl. Phys. Lett. 98 072502
[10] Fei C L, Zhang Y, Yang Z H, Liu Y, Xiong R, Shi J, Ruan X F 2011 J. Magn. Magn. Mater. 323 1811
[11] Manaf A, Buckley R A, Davies H A 1993 J. Magn. Magn. Mater. 128 302
[12] Ding J, McCormick P G, Street R 1993 J. Magn. Magn. Mater 124 1
[13] Hamada N, Mishima C, Mitarati H, Honkura Y 2003 IEEE. Trans. Magn. 5 2953
[14] Mamoru O 2000 Mater. Sci. Eng. A 287 183
[15] Song Q, Ding Y, Wang Z L, Zhang Z 2007 Chem. Mater. 19 4633
[16] Roy D, Anil Lumar P S 2009 J. Appl. Phys. 106 073902
[17] Roy D, Shivakumara C, Anil Kumar P S 2009 J. Magn. Magn. Mater. 321 11
[18] Vázquez-Vázquez C, López-Quintela M A, Buján-Núñez M C, Rivas J 2011 J. Nanopart Res. 13 1663
[19] Henkel O 1964 Phys. Status Solidi 7 919
[20] García-Otero J, Porto M, Rivas J 2000 J. Appl. Phys. 87 7376
[21] Stoner E C, Wohlfarth E P 1948 Philos. Trans. R. Soc. London Ser. A 240 599
[22] Balaji G, Wilde G, Weissmüller J, Gajbhiye N S, Sankaranarayanan V K 2004 Phys. Stat. Sol. B 241 1589
[23] Zhang Y, Liu Y, Fei C L, Yang Z H, Lu Z H, Xiong R, Yin D, Shi J 2012 J. Appl. Phys. 108 084312
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