Large exchange bias and high blocking temperature of MgO-Barrier-MTjs']js with L12-Ordered Mn3lr

被引：17

作者：

Komagaki, Koujiro ^{[1
]}

Yamada, Kouji

Noma, Kenji

Kanai, Hitoshi

Kobayashi, Kazuo

Uehara, Yuji

Tsunoda, Masakiyo

Takahashi, Migaku

机构：

[1] Fujitsu Ltd, Adv Head Technol Dev Dept, Nagano 3818579, Japan

[2] Tohoku Univ, Dept Elect Engn, Sendai, Miyagi 9808579, Japan

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2007年 / 43卷 / 08期

关键词：

blocking temperature; exchange bias; L1(2)(ordered)-Mn(3)lr; MgO barrier; tunnel junction; tunnel magnetoresistance;

D O I：

10.1109/TMAG.2007.893695

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：

We examined the magnetic properties of CoFeB/MgO/CoFeB based magnetic tunnel junctions (MTJs) with L1 (2)(ordered)-Mn3Ir or gamma (disordered)-Mn75Ir25 as an antiferromagnetic (AFM) layer. Both of them showed tunnel magnetoresistance (TMR) ratio of about 160% after 350 degrees C annealing. The exchange bias field (H-ex) of the MTJs with L1(2)-Mn3Ir is significantly larger than that with gamma-MnIr. The blocking temperature (T-B) of the MTJ film with L1(2)-Mn3Ir is about 50 degrees C higher than that with gamma-MnIr. These results prove that L1(2)-Mn3Ir is a great candidate as AFM in MgO-barrier-MTJs and makes them improve in exchange bias properties.

引用

页码：3535 / 3537

页数：3

共 6 条

[1] 230% room-temperature magnetoresistance in CoFeB/MgO/CoFeB magnetic tunnel junctions [J].

Djayaprawira, DD ;

Tsunekawa, K ;

Nagai, M ;

Maehara, H ;

Yamagata, S ;

Watanabe, N ;

Yuasa, S ;

Suzuki, Y ;

Ando, K .

APPLIED PHYSICS LETTERS, 2005, 86 (09) :1-3

[2] Dependence of giant tunnel magnetoresistance of sputtered CoFeB/MgO/CoFeB magnetic tunnel junctions on MgO barrier thickness and annealing temperature [J].

Hayakawa, J ;

Ikeda, S ;

Matsukura, F ;

Takahashi, H ;

Ohno, H .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 2005, 44 (16-19) :L587-L589

[3] Giant exchange anisotropy observed in Mn-Ir/Co-Fe bilayers containing ordered Mn3Ir phase [J].

Imakita, K ;

Tsunoda, M ;

Takahashi, M .

APPLIED PHYSICS LETTERS, 2004, 85 (17) :3812-3814

[4] Giant tunnelling magnetoresistance at room temperature with MgO (100) tunnel barriers [J].

Parkin, SSP ;

Kaiser, C ;

Panchula, A ;

Rice, PM ;

Hughes, B ;

Samant, M ;

Yang, SH .

NATURE MATERIALS, 2004, 3 (12) :862-867

[5] L12 phase formation and giant exchange anisotropy in Mn3Ir/Co-Fe bilayers [J].

Tsunoda, M ;

Imakita, K ;

Naka, M ;

Takahashi, M .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2006, 304 (01) :55-59

[6] Giant room-temperature magnetoresistance in single-crystal Fe/MgO/Fe magnetic tunnel junctions [J].

Yuasa, S ;

Nagahama, T ;

Fukushima, A ;

Suzuki, Y ;

Ando, K .

NATURE MATERIALS, 2004, 3 (12) :868-871

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