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Abstract
With plasma oxidization to create an insulating layer of Al2O3, we have repeatedly fabricated some Ni80Fe20/Al2O3/Co magnetic tunnel junctions (MTJ), which show obvious tunneling magnetoresistance (TMR) effect. The insulating layer is well formed by the oxidization procedure, which is verified by optical spectra and other measurement results. At room temperature, the maximum TMR ratio reaches 6.0%. The switch field can be less than 800A/m and the relative step width is about 2400A/m. The junction resistance Rj changes from hundreds of ohms to hundreds of kilohms and TMR ratio decreases monotonously with the increase of applied junction voltage bias (under zero magnetic field).
Authors and contacts
Du Jun¹,

Chen Jing¹,

Wu Xiao-Shan¹,

Pan Ming-Hu¹,

Long Jian-Guo¹,

Zhang Wei¹,

Lu Mu¹,

Zhai Hong-Ru²,

Hu An¹
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Cited By

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[2]	Tang Jie, Zhang Guo-Ying, Bao Jun-Shan, Liu Gui-Li, Liu Chun-Ming.First-principles study of the effect of S impurity on the adhesion of Fe/Al2O3 interface. Acta Physica Sinica, 2014, 63(18): 187101.doi:10.7498/aps.63.187101
[3]	Wu Zhi-Yan, Kuang Xiao-Yu, Li Hui, Mao Ai-Jie, Wang Zhen-Hua.Study on the ground-state splitting and the local lattice distortion of α-Al2O3：Fe3+ system. Acta Physica Sinica, 2014, 63(1): 017102.doi:10.7498/aps.63.017102
[4]	Cao Yong-Ze, Li Guo-Jian, Wang Qiang, Ma Yong-Hui, Wang Hui-Min, He Ji-Cheng.Effects of high magnetic field on the microstructure and magnetic properties of Fe80Ni20 thin films with different thickness values. Acta Physica Sinica, 2013, 62(22): 227501.doi:10.7498/aps.62.227501
[5]	Zhang Xin, Zhang Xiao-Zhong, Tan Xin-Yu, Yu Yi, Wan Cai-Hua.Enhancing photovoltaic effect of Co2-C98/Al2O3/Si heterostructures by Al2O3. Acta Physica Sinica, 2012, 61(14): 147303.doi:10.7498/aps.61.147303
[6]	Yang Qiu-Hong, Zeng Zhi-Jiang, Xu Jun, Su Liang-Bi.Spectroscopic characteristics of transparent polycrystalline MgO and TiO2 codoped Al2O3 ceramics. Acta Physica Sinica, 2006, 55(6): 2726-2729.doi:10.7498/aps.55.2726
[7]	Guo De-Feng, Geng Wei-Gang, Lan Wei, Huang Chun-Ming, Wang Yin-Yue.Fabrication and properties of the Y-doped Al2O3 high-k gate dielectric films. Acta Physica Sinica, 2005, 54(12): 5901-5906.doi:10.7498/aps.54.5901
[8]	Fu Xiu-Li, Wang Yi, Li Pei-Gang, Chen Lei-Ming, Zhang Hai-Ying, Tu Qing-Yun, L. H. Li, Tang Wei-Hua.Large-scale fabrication and magnetic properties of Ni8080Fe20 20 nanowire arrays. Acta Physica Sinica, 2005, 54(4): 1693-1696.doi:10.7498/aps.54.1693
[9]	Li Zheng, Bai Hai-Yang, Chen Zhao-Jia, Pan Ming-Xiang, Zhao De-Qian, Wang Wan-Lu, Wang Wei-Hua.Investigation of magnetic properties at low temperatures on permanent magnetic N d60Al10Fe20Co10 bulk metallic glass. Acta Physica Sinica, 2003, 52(6): 1461-1464.doi:10.7498/aps.52.1461
[10]	TONG LIU-NIU, HE XIAN-MEI, LU MU.EFFECT OF ANNEALING ON THE MAGNETIC PROPERTIES OF Ni80Ｃo20 THIN FILMS WITH IMPURITY LAYERS. Acta Physica Sinica, 2000, 49(11): 2290-2295.doi:10.7498/aps.49.2290
[11]	LIU CUN-YE, XU QING-YU, NI GANG, SANG HAI, DU YOU-WEI.STUDING ON ELECTROMAGNETIC CHARACTERS OF Fe/Al2O3/Fe TUNNE LING JUNCTIONS. Acta Physica Sinica, 2000, 49(9): 1897-1900.doi:10.7498/aps.49.1897
[12]	WANG MAO-XIANG, SUN CHENG-XIU, SHI XIAO-CHUN, YU JIAN-HUA.RESEARCH OF ELECTRON RESONANT TUNNELING AND LIGHT EMISSION PROPERTIES OF DOUBLE-BARRIER TUNNER JUNCTION. Acta Physica Sinica, 1999, 48(2): 326-331.doi:10.7498/aps.48.326
[13]	ZHU TAO, WANG YIN-JUN.TUNNELING GIANT MAGNETORESISTANCE IN Fe-Al2O3 GRANULAR FILMS. Acta Physica Sinica, 1999, 48(4): 763-768.doi:10.7498/aps.48.763
[14]	Xu Ming, Chai Chun-Lin, Luo Guang-Ming, Yang Tao, Lai Wu-Yan, Mai Zhen-Hong.Effect of Annealing on Microstructure of Ni80Fe20/Cu Multilayers. Acta Physica Sinica, 1999, 48(13): 8-15.doi:10.7498/aps.48.8
[15]	WANG JIAN-PING, LUO HE-LIE.MECHANISM OF THE COERCIVITY FOR THE GRANULAR SOLID. Acta Physica Sinica, 1995, 44(12): 2000-2006.doi:10.7498/aps.44.2000
[16]	LI SHI-PU, FAN DONG-HUI, WANG GUO-MEI, XING NING, REN WEI.X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF Fe ION IMPLANTED POLYCRYSTALLINE Al2O3. Acta Physica Sinica, 1991, 40(6): 857-861.doi:10.7498/aps.40.857
[17]	MA WEN-GAN, LIN ZHI-RONG, ZHANG GUI-GEN, SHU QI-QING, ZHENG KE-QIN.CORRELATION BETWEEN BARRIER PARAMETERS OF Al2O3 TUNNEL JUNCTION AND TOP ELECTRODE METAL. Acta Physica Sinica, 1991, 40(3): 483-489.doi:10.7498/aps.40.483
[18]	JIN TONG-ZHENG, HAN SHI-YING, SUI YUN-XIA.THE ELECTRON PARAMAGNETIC RESONANCE STUDY OF Fe ION IN α-Al2O3 SINGLE CRYSTAL. Acta Physica Sinica, 1988, 37(1): 147-151.doi:10.7498/aps.37.147
[19]	DING YAO-GUO, LIN ZHANG-DA, QI SHANG-XUB, WANG YIN-JUN, QIAN JING-FANG.A STUDY OF INTERFACES OF Co-TREATED γ-Fe2O3 THIN FILMS. Acta Physica Sinica, 1987, 36(12): 1545-1550.doi:10.7498/aps.36.1545
[20]	WANG RUI-LAN, LI HONG-CHENG, GUAN WEI-YAN.DETERMINATION OF SUPERCONDUCTING ENERGY GAP OF HEAVILY DOPED Re THIN FILMS BY ELECTRON TUNNELING. Acta Physica Sinica, 1987, 36(12): 1643-1644.doi:10.7498/aps.36.1643

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Vol. 48, Issue 13 - 1999-07-05

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