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Room-temperature ferromagnetism (FM) is observed in Si-Al2O3 amorphous composite film. The magnetic moment is the highest in the case of the Si-Al2O3 composite films with the Si content being 15 vol.%, and distinct domains are detected in our films. The difference in magnetism property between sample annealed in Ar atmosphere and untreated composite film indicates that the observed ferromagnetism does not originate primarily from oxygen defects. It is concluded that the ferromagnetism arises from the direct coupling between defects. These defects orignate from the interface between Si particles and Al2O3 matrix. By varying the Si content in the film, one can change the defect density and thereby control the strength of the ferromagnetic coupling.
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Keywords:
- Al2O3 film /
- room-temperature ferromagnetism /
- doping /
- exchange interaction
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[31] -
[1] Song H Q, Wang Y, Yan S S, Mei L M, Zhang Z 2008 Acta Phys. Sin. 57 4534 (in Chinese) [宋红强、王 勇、颜世申、梅良模、张 泽 2008 57 4534]
[2] [3] Dietl T, Ohno H, Matsukura F, Cibert J, Ferrand D 2000 Science 287 1019
[4] Zhou S, Potzger K, Zhang G, Mcklich A, Eichhorn F, Schell N, Grzschel R, Schmidt B, Skorupa W, Helm M, Fassbender J, Geiger D 2007 Phys. Rev. B 75 085203
[5] [6] [7] Zhang F M, Liu X C, Gao J, Wu X S, Du Y W, Zhu H, Xiao J Q, Chen P 2004 Appl. Phys. Lett. 85 786
[8] [9] Bandaru P R, Park J, Lee J S, Tang Y J, Chen L, Jin S, Song S A, OBrien J R 2006 Appl. Phys. Lett. 89 112502
[10] Kopnov G, Vager Z, Naaman R 2007 Adv. Mater. 19 925
[11] [12] Wang X F, Chen X S, Dong R B, Huang Y, Lu W 2009 Phys. Lett. A 373 3091
[13] [14] [15] Penga X, Ahuja R 2009 Appl. Phys. Lett. 94 102504
[16] [17] Zhou S, Xu Q, Potzger K, Talut G, Grtzschel R, Fassbender J, Vinnichenko M, Grenzer J, Helm M, Hochmuth H, Lorenz M, Grundmann M, Schmidt H 2008 Appl. Phys. Lett. 93 232507
[18] [19] Herng T S, Lau S P, Wang L, Zhao B C, Yu S F, Tanemura M, Akaike A, Teng K S 2009 Appl. Phys. Lett. 95 012505
[20] Zhou H J, Zhen C M, Zhang Y J, Zhao C L, Ma L, Hou D L 2010 Acta Phys. Sin. 59 3499 (in Chinese) [周鸿娟、甄聪棉、张永进、赵翠莲、马 丽、侯登录 2010 59 3499]
[21] [22] Han K H, Spemann D, Hohne R, Setzer A, Makarova T, Esquinazi P, Butz T 2003 Carbon 41 785
[23] [24] Hong N H, Sakai J, Poirot N, Brize V 2006 Phys. Rev. B 73 132404
[25] [26] Sundaresan A, Bhargavi R, Rangarajan N, Siddesh U, Rao C N R 2006 Phys. Rev. B 74 161306(R)
[27] [28] [29] Yang Q, Deng Y, Hu W 2009 Ceram. Int. 35 1305
[30] Kim Y H, Hwang M S, Kim H J, Kim J Y, Lee Y 2001 J. Appl. Phys. 90 3367
[31]
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