Magnetic Property Enhancement of FePt Films by Zr Underlayering

被引:3
作者
Shen, C. Y. [1 ,2 ]
Chang, H. W. [1 ]
Yuan, F. T. [3 ]
Lin, M. C. [1 ]
Su, C. C. [1 ]
Wang, C. R. [1 ]
Mei, J. K. [4 ]
Chen, C. C. [5 ]
Chang, W. C. [6 ]
机构
[1] Tunghai Univ, Dept Appl Phys, Taichung 407, Taiwan
[2] Hsiuping Univ Sci & Technol, Dept Elect Engn, Taichung 412, Taiwan
[3] iSentek Ltd, Adv Sensor Lab, New Taipei City 22101, Taiwan
[4] Minghsin Univ Sci & Technol, Dept & Inst Elect Engn, Hsinchu 30401, Taiwan
[5] Ling Tung Univ, Dept Int Business, Taichung 408, Taiwan
[6] Natl Chung Cheng Univ, Dept Phys, Chiayi 621, Taiwan
关键词
Energy product; FePt; magnetic thin films; MICROSTRUCTURE; PRODUCTS;
D O I
10.1109/TMAG.2013.2272468
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Structure and magnetic properties of the sputter-prepared FePt (160 nm) and FePt(160 nm)/Zr(10 nm) are studied. The films were deposited at room temperature and followed by a post annealing for magnetic hardening by L1(0)-ordering. Distinct ordering processes are observed. In FePt films, extensive ordering occurs after annealing at T-a = 700 degrees C and forms strong (111) texture. H-c increases to 8.5 kOe with a decrease in M-r of about 10%. In contrast, FePt/Zr samples orders at T-a = 500 degrees C and results in drastic increase in H-c reaching 12.5 kOe with only 2.7% decrease in M-r. The difference in surface morphology of the two samples suggests that the low temperature ordering is a result of the nucleation promotion by Zr underlayer. The refined grain size strengthens the intergrain coupling resulting in greatly enhanced magnetic properties. The value of (BH)(max) for the film with T-a = 500, 600 and 700 degrees C are 16.8, 20.0, and 19.6 MGOe, respectively. The maximum value is more than 110% higher than that of the FePt film annealed at T-a = 700 degrees C (9.5 MGOe).
引用
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页数:4
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