全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
科学通报  2011 

耐高温垂直取向FePt连续薄膜的表面形貌与磁性

DOI: 10.1360/972010-1424, PP. 1188-1195

Keywords: L10,相FePt,连续薄膜,热处理,表面形貌,磁性

Full-Text   Cite this paper   Add to My Lib

Abstract:

用磁控溅射法在加热到400℃的MgO(001)单晶基片上沉积了总厚度为25nm的[Fe(0.6nm)/Fe30.5Pt69.5(1.9nm)]10多层连续薄膜,总成分配比为Fe50Pt50.然后对其在[500,900]℃温度范围进行真空热处理,分析了热处理温度对薄膜表面形貌、晶体结构以及磁特性的影响.结果表明,在加热基片上生长的FePt薄膜,层间已经发生扩散,形成无序的A1相.经过700℃以上的高温热处理,薄膜转变为具有(001)织构的L10相FePt合金,易磁化轴沿垂直于膜面的方向,有序度大于0.85,单轴磁晶各向异性能约2.7×107erg/cc.利用扩散后残存的周期性微弱成分起伏,可以使薄膜在800℃以下保持形貌连续.用原子力显微镜对薄膜表面进行观察证实,在780℃进行热处理,薄膜的表面最平整.这种优质的连续薄膜可以应用于微加工制作超高密度垂直磁记录阵列介质.

References

[1]  1 Skomski R. Nanomagnetics. J Phys: Condens Matter, 2003, 15: R841-R896??
[2]  2 Weller D, Moser A, Folks L, et al. High Ku materials approach to 100 Gbits/in2. IEEE Trans Magn, 2000, 36: 10-15??
[3]  3 Sun S. Recent advances in chemical synthesis, self-assembly, and applications of FePt nanoparticles. Adv Mater, 2006, 18: 393-403??
[4]  10 Albrecht M, Ganesan S, Rettner C T, et al. Patterned perpendicular and longitudinal media: A magnetic recording study. IEEE TransMagn, 2003, 39: 2323-2325
[5]  14 Okamoto S, Kikuchi N, Kitakami O, et al. Magnetization reversal process in FePt L10 nanoparticles. Script Mater, 2005, 53: 395-401??
[6]  16 莫小静, 向晖, 郑远平, 等. 在MgO(001)基板上生长连续的L10-FePt 纳米薄膜. 中国科学: 物理学 力学 天文学, 2011, 41: 78-85
[7]  20 Seki T, Shima T, Yakushiji K, et al. Dot size dependence of magnetic properties in microfabricated L10-FePt (001) and L10-FePt (110) dotarrays. J Appl Phys, 2006, 100: 043915-043922??
[8]  21 Seki T, Shima T, Yakushiji K, et al. Improvement of hard magnetic properties in microfabricated L10-FePt dot arrays upon post-annealing.IEEE Trans Magn, 2005, 41: 3604-3606??
[9]  22 Li G Q, Saito H, Ishio S, et al. Asymmetric initial magnetization process of elongated particles in nucleation-type L10 FePt films. J MagnMagn Mater, 2007, 315: 126-131??
[10]  26 Li G Q, Takahoshi H, Ito H, et al. Mechanism of magnetization process of island-like L10 FePt films. J Magn Magn Mater, 2005, 287:219-223??
[11]  27 Okamoto S, Kikuchi N, Kitakami O, et al. Chemical-order-dependent magnetic anisotropy and exchange stiffness constant of FePt (001)epitaxial films. Phys Rev B, 2002, 66: 024413??
[12]  4 Ristau R A, Barmak K, Lewis L H, et al. On the relationship of high coercivity and L10 ordered phase in CoPt and FePt thin films. J ApplPhys, 1999, 86: 4527-4533
[13]  5 Takahashi Y, Matsubara E, Kawazoe Y, et al. Reconstruction of atomic images from multiple-energy X-ray holograms of FePt films bythe scattering pattern matrix method. Appl Phys Lett, 2005, 87: 234104??
[14]  6 Shima T, Takanashi K, Takahashi Y K, et al. High coercivity and magnetic domain observation in epitaxially grown particulate FePt thinfilms. J Magn Magn Mater, 2003, 266: 171-177??
[15]  7 Zhang Y, Wan J, Skumryev V, et al. Microstructural characterization of L10 FePt/MgO nanoparticles with perpendicular anisotropy. ApplPhys Lett, 2004, 85: 5343-5345??
[16]  8 Ross C A. Patterned magnetic recording media. Annu Rev Mater Res, 2001, 31: 203-235??
[17]  9 Lomakin V, Choi R, Livshitz B, et al. Dual-layer patterned media “ledge” design for ultrahigh density magnetic recording. Appl Phys Lett,2008, 92: 022502??
[18]  11 Okamoto S, Kikuchi N, Kato T, et al. Magnetization behavior of nanomagnets for patterned media application. J Magn Magn Mater, 2008,320: 2874-2879??
[19]  12 Murillo R, van Wolferen H A, Abelmann L, et al. Fabrication of patterned magnetic nanodots by laser interference lithography. MicroeletrEng, 2005, 78-79: 260-265
[20]  13 Kikuchi N, Okamoto S, Kitakami O, et al. Sensitive detection of irreversible switching in a single FePt nanosized dot. Appl Phys Lett,2003, 82: 4313-4315??
[21]  15 Kikuchi N, Okamoto S, Kitakami O. The critical size between single domain and multidomain in L10-FePt particles. J Appl Phys, 2008,103: 07D511
[22]  17 Okamoto S, Kitakami O, Shimada Y. Crystal distortion and the magnetic moment of epitaxially grown α ″-Fe16N2. J Magn Magn Mater,2000, 208: 102-114??
[23]  18 Thiele J U, Folks L, Toney M F, et al. Perpendicular magnetic anisotropy and magnetic domain structure in sputtered epitaxial FePt (001)L10 films. J Appl Phys, 1998, 84: 5686-5692??
[24]  19 Chen J S, Lim B C, Hu J F, et al. High coercivity L10 FePt films with perpendicular anisotropy deposited on glass substrate at reducedtemperature. Appl Phys Lett, 2007, 90: 042508??
[25]  23 莫小静, 向晖, 李国庆, 等. 垂直取向L10 FePt 纳米粒子的磁性. 科学通报, 2010, 55: 534-540
[26]  24 Shima T, Takanashi K, Takanashi Y K, et al. Coercivity exceeding 100 kOe in epitaxially grown FePt sputtered films. Appl Phys Lett,2004, 85: 2571-2573??
[27]  25 Li G Q, Takahoshi H, Ito H, et al. Morphology and domain pattern of L10 FePt films. J Appl Phys, 2003, 94: 5672-5677??

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133