Tunneling spectroscopy in CoFeB/MgO/CoFeB magnetic tunnel junctions

被引：16

作者：

Ono, K

Daibou, T

Ahn, SJ

Sakuraba, Y

Miyakoshi, T

Morita, T

Kikuchi, Y

Oogane, M

Ando, Y

Miyazaki, T

机构：

[1] ULVAC Inc, Tsukuba Inst Super Mat, Tsukuba, Ibaraki 3002635, Japan

[2] Tohoku Univ, Res Inst Elect Commun, Lab Nanoelect & Spintron, Aoba Ku, Sendai, Miyagi 9808577, Japan

[3] Tohoku Univ, Grad Sch Engn, Dept Appl Phys, Sendai, Miyagi 9808579, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 2006年 / 99卷 / 08期

关键词：

D O I：

10.1063/1.2173628

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The d(2)V/dI(2)-V measurements were used to investigate the tunneling mechanism in CoFeB/MgO/CoFeB magnetic tunnel junctions (MTJs), which showed a giant tunnel magnetoresistance ratio up to 200% at room temperature. The d(2)V/dI(2)-V spectra of CoFeB/MgO/CoFeB junctions resemble those of single-crystal Fe(001)/MgO(001)/Fe(001) MTJs. Broad peaks appeared around +/- 600 mV in spectra for antiparallel magnetic configurations. A complex structure was apparent in the spectra for parallel configurations. We inferred that giant tunnel magnetoresistance observed in CoFeB/MgO/CoFeB junctions originates in coherent tunneling between the Delta(1) bands of crystallized CoFeB electrodes. (C) 2006 American Institute of Physics.

引用

收藏

页数：3

相关论文

共 10 条

[1] Spin-dependent tunneling spectroscopy in single-crystal Fe/MgO/Fe tunnel junctions [J].

Ando, Y ;

Miyakoshi, T ;

Oogane, M ;

Miyazaki, T ;

Kubota, H ;

Ando, K ;

Yuasa, S .

APPLIED PHYSICS LETTERS, 2005, 87 (14) :1-3

[2] Spin-dependent tunneling conductance of Fe|MgO|Fe sandwiches -: art. no. 054416 [J].

Butler, WH ;

Zhang, XG ;

Schulthess, TC ;

MacLaren, JM .

PHYSICAL REVIEW B, 2001, 63 (05)

[3] 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

[4] 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

[5] Theory of tunneling magnetoresistance of an epitaxial Fe/MgO/Fe(001) junction [J].

Mathon, J ;

Umerski, A .

PHYSICAL REVIEW B, 2001, 63 (22)

[6]

MIYAZAKI T, 1995, J MAGN MAGN MATER, V139, pL231, DOI 10.1016/0304-8853(94)01648-8

[7] LARGE MAGNETORESISTANCE AT ROOM-TEMPERATURE IN FERROMAGNETIC THIN-FILM TUNNEL-JUNCTIONS [J].

MOODERA, JS ;

KINDER, LR ;

WONG, TM ;

MESERVEY, R .

PHYSICAL REVIEW LETTERS, 1995, 74 (16) :3273-3276

[8] 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

[9] 70% TMR at room temperature for SDT sandwich junctions with CoFeB as free and reference layers [J].

Wang, DX ;

Nordman, C ;

Daughton, JM ;

Qian, ZH ;

Fink, J .

IEEE TRANSACTIONS ON MAGNETICS, 2004, 40 (04) :2269-2271

[10] 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