Tunneling magnetoresistance above room temperature in La0.7Sr0.3MnO3/SrTiO3/La0.7Sr0.3MnO3 junctions

被引：47

作者：

Ogimoto, Y

Izumi, M

Sawa, A

Manako, T

Sato, H

Akoh, H

Kawasaki, M

Tokura, Y

机构：

[1] JRCAT, Tsukuba, Ibaraki 3050046, Japan

[2] AIST, CERC, Tsukuba, Ibaraki 3058562, Japan

[3] NEC Corp Ltd, Fundamental Res Labs, Tsukuba, Ibaraki 3058501, Japan

[4] Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan

[5] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS | 2003年 / 42卷 / 4A期

关键词：

tunneling magnetoresistance; spin tunnel junction; half-metal; La1-xSrxMnO3; perovskite superlattice; spin canting; charge transfer;

D O I：

10.1143/JJAP.42.L369

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have investigated the undesired reduction of spin polarization in La1-xSrxMnO3 (LSMO)/SrTiO3 (STO)/LSMO spin tunnel junctions by employing superlattices of LSMO/STO with various x of 0.2, 0.3, and 0.4. The systematic data revealed that the instability towards the A-type (layered) antiferromagnetic phase dominates the suppressed ferromagnetism by spin canting in the vicinity of the interface as x increases. Another boundary condition of reduced Curie temperature (T-C) for x < 0.3 gives us a trade-off for the choice of x in spin tunnel junctions. Indeed, atomically regulated LSMO/STO/LSMO tunnel junctions with x = 0.3 show tunneling magnetoresistance above room temperature up to 320 K, which agrees well with T-C of the superlattices with the same x.

引用

收藏

页码：L369 / L372

页数：4

相关论文

共 24 条

[1] TUNNELING CONDUCTANCE OF ASYMMETRICAL BARRIERS [J].

BRINKMAN, WF ;

DYNES, RC ;

ROWELL, JM .

JOURNAL OF APPLIED PHYSICS, 1970, 41 (05) :1915-&

[2] Phase diagram of tetragonal manganites [J].

Fang, Z ;

Solovyev, IV ;

Terakura, K .

PHYSICAL REVIEW LETTERS, 2000, 84 (14) :3169-3172

[3] Structure characterization and magnetic properties of oxide superlattices La0.6Sr0.4MnO3/La0.6Sr0.4FeO3 [J].

Izumi, M ;

Murakami, Y ;

Konishi, Y ;

Manako, T ;

Kawasaki, M ;

Tokura, Y .

PHYSICAL REVIEW B, 1999, 60 (02) :1211-1215

[4] Interface effect and its doping dependence in La1-xSrxMnO3/SrTiO3 supertattices [J].

Izumi, M ;

Ogimoto, Y ;

Manako, T ;

Kawasaki, M ;

Tokura, Y .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2002, 71 (11) :2621-2624

[5] Insulator-metal transition induced by interlayer coupling in La0.6Sr0.4MnO3/SrTiO3 superlattices -: art. no. 064429 [J].

Izumi, M ;

Ogimoto, Y ;

Okimoto, Y ;

Manako, T ;

Ahmet, P ;

Nakajima, K ;

Chikyow, T ;

Kawasaki, M ;

Tokura, Y .

PHYSICAL REVIEW B, 2001, 64 (06) :644291-644296

[6] Very large magnetoresistance and coherent switching in half-metallic manganite tunnel junctions [J].

Jo, MH ;

Mathur, ND ;

Todd, NK ;

Blamire, MG .

PHYSICAL REVIEW B, 2000, 61 (22) :14905-14908

[7] Orbital-state-mediated phase-control of manganites [J].

Konishi, Y ;

Fang, Z ;

Izumi, M ;

Manako, T ;

Kasai, M ;

Kuwahara, H ;

Kawasaki, M ;

Terakura, K ;

Tokura, Y .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1999, 68 (12) :3790-3793

[8] Large magnetoresistance in La0.7Sr0.3MnO3/SrTiO3/La0.7Sr0.3MnO3 ramp-edge junctions [J].

Kwon, C ;

Jia, QX ;

Fan, Y ;

Hundley, MF ;

Reagor, DW ;

Coulter, JY ;

Peterson, DE .

APPLIED PHYSICS LETTERS, 1998, 72 (04) :486-488

[9] Origin of high transport spin polarization in La0.7Sr0.3MnO3:: Direct evidence for minority spin states -: art. no. 184433 [J].

Nadgorny, B ;

Mazin, II ;

Osofsky, M ;

Soulen, RJ ;

Broussard, P ;

Stroud, RM ;

Singh, DJ ;

Harris, VG ;

Arsenov, A ;

Mukovskii, Y .

PHYSICAL REVIEW B, 2001, 63 (18)

[10] Magnetotransport in manganite trilayer junctions grown by 90° off-axis sputtering [J].

Noh, JS ;

Nath, TK ;

Eom, CB ;

Sun, JZ ;

Tian, W ;

Pan, XQ .

APPLIED PHYSICS LETTERS, 2001, 79 (02) :233-235