Effect of Magnetic Annealing on IrMn Based Spin Valve Materials with SAF Structure

doi:10.3724/SP.J.1077.2014.13327

Journal of Inorganic Materials ›› 2014, Vol. 29 ›› Issue (4): 411-416.DOI: 10.3724/SP.J.1077.2014.13327

• Research Paper • Previous Articles Next Articles

Effect of Magnetic Annealing on IrMn Based Spin Valve Materials with SAF Structure

Li Jian-Ping^1,2, QIAN Zheng-Hong^1,2, SUN Yu-Cheng^1,2, BAI Ru², LIU Jian-Lin², ZHU Jian-Guo¹

(1. College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China; 2. Center for Integrated Spintronic Devices, Hangzhou Dianzi University, Hangzhou 310018, China)

Received:2013-06-25 Revised:2013-07-21 Published:2014-04-20 Online:2014-03-24
About author:Li Jian-Ping. E-mail:hero-ljp@163.com
Supported by:
National Program on Key Basic Research Project(2011CBA00602); Major Science and Technology Special Theme of Zheiiand Province (2011c2011c11047); Innovation Research Team for Spintronic Materials and Derices of Zheiang Province (2009[171])

Abstract

Abstract: IrMn based spin valve materials with SAF (CoFe/Ru/CoFe) structure were deposited by magnetron sputtering system. HRTEM, AFM and XPS techniques were utilized to characterize the microstructures and composition of the spin valve materials. First, the deposited materials were annealed at 200℃, 245℃, 255℃ and 265℃ for 4 h in vacuum (＜10^-5 Pa). It was found that obvious interlayer diffusion was happened after being annealed at 265℃, which resulted in the decrease of magneto-resistance (MR) ratio. Set field annealing temperature at 245℃, the spin valve materials were annealed at fields of 80, 160, 240, 400 and 560 kA/m along the pinning direction for 4 h in vacuum, respectively. It was found that the MR ratio of the materials declined to 5.87% and 6.31% from 8.80% after 80 kA/m and 160 kA/m annealing, respectively. After 240 kA/m annealing, the MR ratio became 7.91%. After 400 kA/m annealing, the MR ratio increased to 9.89%. After 560 kA/m annealing, the MR ratio reached 10.79%, which was increased by 22.6% as compared with the material before annealing.

Key words: SAF, spin valve, magnetic annealing

CLC Number:

TQ174

Li Jian-Ping, QIAN Zheng-Hong, SUN Yu-Cheng, BAI Ru, LIU Jian-Lin, ZHU Jian-Guo. Effect of Magnetic Annealing on IrMn Based Spin Valve Materials with SAF Structure[J]. Journal of Inorganic Materials, 2014, 29(4): 411-416.

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Effect of Magnetic Annealing on IrMn Based Spin Valve Materials with SAF Structure

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