Thermodynamic measurements of magnetic ordering in antiferromagnetic superlattices

被引：108

作者：

Abarra, EN ^{[1
]}

Takano, K ^{[1
]}

Hellman, F ^{[1
]}

Berkowitz, AE ^{[1
]}

机构：

[1] UNIV CALIF SAN DIEGO,CTR MAGNET RECORDING RES,LA JOLLA,CA 92093

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 77卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.77.3451

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Direct measurements of heat capacity from 80 to 540 K of antiferromagnetic superlattices of NiO (high Neel temperature TN), COO (low T-N), and MgO (nonmagnetic) are used to study the effect of exchange coupling and layer thickness on magnetic ordering: NiO/CoO superlattices with thin layers show a single heat capacity peak similar to a Ni0.5Co0.5O alloy; with increasing layer thickness, the peak splits into two maxima Finite size effects are seen in uncoupled NiO and CoO. Observed shifts in TN show the importance of correlation lengths and spin fluctuations in the ordering.

引用

页码：3451 / 3454

页数：4

共 20 条

[1] Finite-size effects and uncompensated magnetization in thin antiferromagnetic CoO layers [J].

Ambrose, T ;

Chien, CL .

PHYSICAL REVIEW LETTERS, 1996, 76 (10) :1743-1746

[2]

BANDO Y, 1989, MRS INT M ADV MATS, V10, P83

[3] SPATIALLY MODULATED ANTIFERROMAGNETIC ORDER IN COO/NIO SUPERLATTICES [J].

BORCHERS, JA ;

CAREY, MJ ;

ERWIN, RW ;

MAJKRZAK, CF ;

BERKOWITZ, AE .

PHYSICAL REVIEW LETTERS, 1993, 70 (12) :1878-1881

[4] CHARACTERIZATION OF EPITAXIAL SPUTTERED NIXCO1-XO THIN-FILMS ON ALPHA-AL2O3 USING TRANSMISSION ELECTRON-MICROSCOPY [J].

CAO, W ;

THOMAS, G ;

CAREY, MJ ;

BERKOWITZ, AE .

SCRIPTA METALLURGICA ET MATERIALIA, 1991, 25 (12) :2633-2638

[5] STRONG INTERLAYER COUPLING IN COO/NIO ANTIFERROMAGNETIC SUPERLATTICES [J].

CAREY, MJ ;

BERKOWITZ, AE ;

BORCHERS, JA ;

ERWIN, RW .

PHYSICAL REVIEW B, 1993, 47 (15) :9952-9955

[6] PREPARATION AND STRUCTURAL CHARACTERIZATION OF SPUTTERED COO, NIO, AND NI0.5CO0.5O THIN EPITAXIAL-FILMS [J].

CAREY, MJ ;

SPADA, FE ;

BERKOWITZ, AE ;

CAO, W ;

THOMAS, G .

JOURNAL OF MATERIALS RESEARCH, 1991, 6 (12) :2680-2687

[7] PHASE-TRANSITIONS IN ANTIFERROMAGNETIC SUPERLATTICES [J].

CARRICO, AS ;

CAMLEY, RE .

PHYSICAL REVIEW B, 1992, 45 (22) :13117-13120

[8] THIN-FILM MICROCALORIMETER FOR HEAT-CAPACITY MEASUREMENTS FROM 1.5-K TO 800-K [J].

DENLINGER, DW ;

ABARRA, EN ;

ALLEN, K ;

ROONEY, PW ;

MESSER, MT ;

WATSON, SK ;

HELLMAN, F .

REVIEW OF SCIENTIFIC INSTRUMENTS, 1994, 65 (04) :946-958

[9] QUANTITATIVE CHARACTERIZATION OF EPITAXIAL SUPERLATTICES BY X-RAY-DIFFRACTION AND HIGH-RESOLUTION ELECTRON-MICROSCOPY [J].

FULLERTON, EE ;

CAO, W ;

THOMAS, G ;

SCHULLER, IK ;

CAREY, MJ ;

BERKOWITZ, AE .

APPLIED PHYSICS LETTERS, 1993, 63 (04) :482-484

[10] Spin-valve heads utilizing antiferromagnetic NiO layers [J].

Hamakawa, Y ;

Hoshiya, H ;

Kawabe, T ;

Suzuki, Y ;

Arai, R ;

Nakamoto, K ;

Fuyama, M ;

Sugita, Y .

IEEE TRANSACTIONS ON MAGNETICS, 1996, 32 (01) :149-155

← 1 2 →