Composition and size dependence of magnetic properties of FePt/Fe exchange-spring films

被引：9

作者：

Song, Yu ^{[1
]}

Zhang, Zhe ^{[1
]}

Duan, Nian ^{[1
]}

Wang, Jiawei ^{[1
]}

Chen, Yuang ^{[1
]}

Tong, Bei ^{[1
]}

Yang, Xiaofei ^{[1
]}

Zhang, Yue ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2014年 / 371卷

基金：

中国国家自然科学基金;

关键词：

Magnetic properties; FePt/Fe; Exchange-spring; Micromagnetic simulation; PERPENDICULAR MAGNETIZATION; PERMANENT-MAGNETS; ENERGY PRODUCT; COERCIVITY; BILAYERS; MEDIA; 3D;

D O I：

10.1016/j.jmmm.2014.07.029

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The composition and size dependence of the magnetic properties of FePt/Fe exchange-spring bilayer films was studied using micromagnetic simulation. Based on the simulated hysteresis loops for composite layers with an identical thickness of 20 am and different composition ratios, it can be observed that when the thickness ratio of Fe is 10%, an exchange-spring effect with a negative nucleation field appears; the switching field is greatly reduced compared to the rigid magnetic FePt, and the squareness ratio reaches its maximum value. When the thickness ratio of Fe is 25% and more, the nucleation fields become positive; meanwhile, the coercivity is smaller than the switching field, and the squareness ratio decreases because of the increase in the thickness of the Fe film. In addition, at a Fixed thickness ratio and total volume, the switching field of the FePt/Fe bilayer films is further reduced, accompanied by a decrease in the squareness ratio due to an increase in the thickness of the Fe layer. (C) 2014 Elsevier B.V. All rights reserved,

引用

页码：100 / 105

页数：6

共 29 条

[1] Exchange coupling and magnetic anisotropy at Fe/FePt interfaces [J].

Aas, C. J. ;

Hasnip, P. J. ;

Cuadrado, R. ;

Plotnikova, E. M. ;

Szunyogh, L. ;

Udvardi, L. ;

Chantrell, R. W. .

PHYSICAL REVIEW B, 2013, 88 (17)

[2] Magnetic phase diagram and demagnetization processes in perpendicular exchange-spring multilayers [J].

Asti, G ;

Ghidini, M ;

Pellicelli, R ;

Pernechele, C ;

Solzi, M ;

Albertini, F ;

Casoli, F ;

Fabbrici, S ;

Pareti, L .

PHYSICAL REVIEW B, 2006, 73 (09)

[3] Micromagnetic analysis of exchange-coupled hard-soft planar nanocomposites [J].

Asti, G ;

Solzi, M ;

Ghidini, M ;

Neri, FM .

PHYSICAL REVIEW B, 2004, 69 (17) :174401-1

[4] Exchange-coupled L10-FePt/Fe composite patterns with perpendicular magnetization [J].

Breitling, A. ;

Bublat, T. ;

Goll, D. .

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS, 2009, 3 (05) :130-132

[5] Temperature dependence of the magnetic properties of L10-FePt nanostructures and films [J].

Bublat, T. ;

Goll, D. .

JOURNAL OF APPLIED PHYSICS, 2010, 108 (11)

[6] Role of interface morphology in the exchange-spring behavior of FePt/Fe perpendicular bilayers [J].

Casoli, F. ;

Albertini, F. ;

Nasi, L. ;

Fabbrici, S. ;

Cabassi, R. ;

Bolzoni, F. ;

Bocchi, C. ;

Luches, P. .

ACTA MATERIALIA, 2010, 58 (10) :3594-3601

[7] Strong coercivity reduction in perpendicular FePt/Fe bilayers due to hard/soft coupling [J].

Casoli, F. ;

Albertini, F. ;

Nasi, L. ;

Fabbrici, S. ;

Cabassi, R. ;

Bolzoni, F. ;

Bocchi, C. .

APPLIED PHYSICS LETTERS, 2008, 92 (14)

[8] 3D calculation of hysteresis loops, magnetic orientations and reversal processes for exchange-spring bilayers with perpendicular anisotropy [J].

Chen, B. Z. ;

Zhao, G. P. ;

Zhang, H. W. ;

Zhong, Z. Y. .

PHYSICA B-CONDENSED MATTER, 2012, 407 (23) :4574-4578

[9] Critical fields of an exchange coupled two-layer composite particle [J].

Goll, D. ;

Kronmueller, H. .

PHYSICA B-CONDENSED MATTER, 2008, 403 (10-11) :1854-1859

[10] Experimental realization of graded L10-FePt/Fe composite media with perpendicular magnetization [J].

Goll, D. ;

Breitling, A. ;

Gu, L. ;

van Aken, P. A. ;

Sigle, W. .

JOURNAL OF APPLIED PHYSICS, 2008, 104 (08)

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