Magnetic transport mechanism in double ferromagnetic tunnel junctions with two-dimensional ferromagnetic particles

被引：2

作者：

Sukegawa, H ^{[1
]}

Hirohata, A

Nakamura, S

Tezuka, N

Sugimoto, S

Inomata, K

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan

[2] RIKEN, Wako, Saitama 3510198, Japan

[3] Aoyama Gakuin Univ, Sagamihara, Kanagawa 2298558, Japan

[4] Japan Sci & Technol Agcy, CREST, Kawaguchi 3320012, Japan

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2005年 / 41卷 / 10期

关键词：

co-tunneling; double tunnel junction; nano-particles; tunnel magnetoresistance;

D O I：

10.1109/TMAG.2005.855292

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：

Magnetic transport properties of Co90Fe10/AIO(infinity) /Co90Fe10/AIO(x)/Co90Fe10 ferromagnetic-double tunnel junctions have been investigated with respect to the thermal fluctuation. A middle Co90Fe10 layer is discontinuous by forming Co90Fe10 particles two-dimensionally, which shows superparAmagnetic behavior above 80 K. The average diameter of the Co90Fe10 particles is estimated to be 4.8-5.0 nm from both a magnetization curve at room temperature and temperature dependence of coercivities deduced from magnetoresistance curves. This finding agrees with the maximum diameter (5.2 nm) evaluated from cross-sectional transmission electron microscope images, revealing that the dominant electron transport process heavily depends on the largest particles.

引用

页码：2679 / 2681

页数：3

共 8 条

[1] Grabert H., 1992, Single Charge Tunneling
[2] INTRINSIC FLUCTUATIONS IN A SUPERCONDUCTING RING CLOSED WITH A JOSEPHSON JUNCTION
KURKIJARVI, J
[J]. PHYSICAL REVIEW B-SOLID STATE, 1972, 6 (03): : 832 - +
[3] Thermally activated annihilation of an individual domain in submicrometer nickel particles
Lok, JGS
Geim, AK
Wyder, U
Maan, JC
Dubonos, SV
[J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 204 (03) : 159 - 164
[4] Magnetoresistance of Ni/NiO/Co small tunnel junctions in Coulomb blockade regime
Ono, K
Shimada, H
Kobayashi, S
Ootuka, Y
[J]. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1996, 65 (11) : 3449 - 3451
[5] DETERMINATION OF ANISOTROPY-FIELD DISTRIBUTION IN PARTICLE ASSEMBLIES TAKING INTO ACCOUNT THERMAL FLUCTUATIONS
PFEIFFER, H
[J]. PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 1990, 118 (01): : 295 - 306
[6] Significant magnetoresistance enhancement due to a cotunneling process in a double tunnel junction with single discontinuous ferromagnetic layer insertion
Sukegawa, H
Nakamura, S
Hirohata, A
Tezuka, N
Inomata, K
[J]. PHYSICAL REVIEW LETTERS, 2005, 94 (06)
[7] Effect of Coulomb blockade on magnetoresistance in ferromagnetic tunnel junctions
Takahashi, S
Maekawa, S
[J]. PHYSICAL REVIEW LETTERS, 1998, 80 (08) : 1758 - 1761
[8] Experimental evidence of the Neel-Brown model of magnetization reversal
Wernsdorfer, W
Orozco, EB
Hasselbach, K
Benoit, A
Barbara, B
Demoncy, N
Loiseau, A
Pascard, H
Mailly, D
[J]. PHYSICAL REVIEW LETTERS, 1997, 78 (09) : 1791 - 1794

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