Structural evolution and magnetic behavior of Co/Ag multilayers submitted to thermal annealing

被引:13
作者
Flores, WH
Teixeira, SR
Geshev, J
da Cunha, JBM
Schilling, PJ
Traverse, A
Alves, MCM
机构
[1] UFRGS, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil
[2] Ctr Adv Microstruct & Devices, Baton Rouge, LA USA
[3] Univ Paris Sud, LURE, F-91405 Orsay, France
[4] Lab Nacl Luz Sincrotron, BR-13081970 Campinas, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
magnetic properties; thin films; multilayers;
D O I
10.1016/S0304-8853(98)00142-5
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report on the structural evolution and the magnetic behavior of the Co/Ag multilayered films deposited in a UHV chamber at room temperature, submitted to 10 min thermal annealing at temperatures ranging from 100 to 600 degrees C. The structural characterization was performed using X-ray diffraction and X-ray absorption spectroscopy techniques. Magnetoresistance and magnetization measurements were used to study the evolution and magnetic behavior of the samples. The results show that, besides the roughness;It the interfaces and the structural disorder of the Co layers, the as-deposited sample has a compressive stress at Ag-Co interface originated by the difference between the surface energies of Ag and Co. After annealing at 400 degrees C, there is a breakup of the layers accompanied by a relaxation of the stress and defects as well as partial crystallographic ordering of the Co clusters. The room-temperature magnetoresistance change from anisotropic magnetoresistance to giant magnetoresistance with a sharp maximum, reaching 4.5%. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:17 / 29
页数:13
相关论文
共 43 条
[11]   A 2-CRYSTAL MONOCHROMATOR FOR THE UVX RING OF LNLS [J].
CORREA, MC ;
TOLENTINO, H ;
CRAIEVICH, A ;
CUSATIS, C .
REVIEW OF SCIENTIFIC INSTRUMENTS, 1992, 63 (01) :896-898
[12]   MICROSTRUCTURAL INVESTIGATION OF AS-DEPOSITED CO-AG NANO-GRANULAR FILMS [J].
DU, JH ;
LI, Q ;
WANG, LC ;
SANG, H ;
ZHANG, SY ;
DU, YW ;
FENG, D .
JOURNAL OF PHYSICS-CONDENSED MATTER, 1995, 7 (49) :9425-9432
[13]  
Gans R, 1932, ANN PHYS-BERLIN, V15, P28
[14]   THERMOMAGNETIC CURVES FOR A DISORDERED SYSTEM OF SINGLE-DOMAIN FERROMAGNETIC PARTICLES WITH CUBIC ANISOTROPY [J].
GESHEV, J ;
POPOV, O ;
MASHEVA, V ;
MIKHOV, M .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1990, 92 (02) :185-190
[15]   REMANENCE CURVES FOR A DISORDERED SYSTEM OF 3-AXIAL AND 4-AXIAL FINE PARTICLES - HENKEL-TYPE PLOTS [J].
GESHEV, J ;
MIKHOV, M .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1992, 104 (pt 3) :1569-1570
[16]  
GREGG JF, 1994, PHYS REV B, V49, P1065
[17]   SUPERPARAMAGNETISM IN MELT-SPUN CUCO GRANULAR SAMPLES [J].
HICKEY, BJ ;
HOWSON, MA ;
MUSA, SO ;
TOMKA, GJ ;
RAINFORD, BD ;
WISER, N .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1995, 147 (03) :253-259
[18]   LIMITATIONS OF MAGNETORESISTIVE SENSORS BASED ON THE GIANT MAGNETORESISTIVE EFFECT IN GRANULAR MAGNETIC COMPOSITES [J].
HYLTON, TL .
APPLIED PHYSICS LETTERS, 1993, 62 (19) :2431-2433
[19]   GIANT MAGNETORESISTANCE AT LOW FIELDS IN DISCONTINUOUS NIFE-AG MULTILAYER THIN-FILMS [J].
HYLTON, TL ;
COFFEY, KR ;
PARKER, MA ;
HOWARD, JK .
SCIENCE, 1993, 261 (5124) :1021-1024
[20]  
JOFFE I, 1974, PHILOS MAG, V314, P1051