MAGNETIC-PROPERTIES OF FREE COBALT CLUSTERS

被引：429
作者：
BUCHER, JP
DOUGLASS, DC
BLOOMFIELD, LA
机构：
[1] Department of Physics, University of Virginia, Charlottesville
来源：
PHYSICAL REVIEW LETTERS | 1991年 / 66卷 / 23期
关键词：
D O I：
10.1103/PhysRevLett.66.3052
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have studied the magnetic properties of cobalt clusters in a beam as functions of cluster size (N = 20-200), magnetic field, and cluster temperature. The measured magnetic moments per atom increase with applied magnetic field and cluster size but decrease with increasing temperature, consistent with superparamagnetic behavior. Rapid orientation fluctuations of the true magnetic moments of these isolated particles yield the smaller, time-averaged, observed values. The true magnetic moments are (2.08 +/- O.20)mu-B per atom and exceed the bulk value. Magnetically resolved isomers are seen for N = 55-66.
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页码：3052 / 3055
页数：4
相关论文
共 17 条
[1]  
BLOOMFIELD LA, IN PRESS
[2]   A PULSED SUPERSONIC EXPANSION WITH A SOURCE TEMPERATURE BELOW 100-K [J].
BUCHER, JP ;
DOUGLASS, DC ;
XIA, P ;
BLOOMFIELD, LA .
REVIEW OF SCIENTIFIC INSTRUMENTS, 1990, 61 (09) :2374-2377
[3]  
BUCHER JP, IN PRESS Z PHYS D
[4]   MAGNETIC-BEHAVIOR OF FREE-IRON AND IRON-OXIDE CLUSTERS [J].
COX, DM ;
TREVOR, DJ ;
WHETTEN, RL ;
ROHLFING, EA ;
KALDOR, A .
PHYSICAL REVIEW B, 1985, 32 (11) :7290-7298
[5]   SPIN RELAXATION IN SMALL FREE IRON CLUSTERS [J].
DEHEER, WA ;
MILANI, P ;
CHATELAIN, A .
PHYSICAL REVIEW LETTERS, 1990, 65 (04) :488-491
[6]   SYMMETRY AND CLUSTER MAGNETISM [J].
DUNLAP, BI .
PHYSICAL REVIEW A, 1990, 41 (10) :5691-5694
[7]   MAGNETIC-PROPERTIES OF NI FINE PARTICLES [J].
FURUBAYASHI, T ;
NAKATANI, I .
SOLID STATE COMMUNICATIONS, 1990, 74 (08) :821-824
[8]  
KHANNA SK, IN PRESS
[9]   SUPERPARAMAGNETISM OF VERY SMALL COBALT PARTICLES STUDIED BY MOSSBAUER-SPECTROSCOPY [J].
KORECKI, J ;
KROP, K .
SURFACE SCIENCE, 1981, 106 (1-3) :444-452
[10]   ELECTRONIC-STRUCTURE OF SMALL CLUSTERS OF NICKEL AND IRON [J].
LEE, KY ;
CALLAWAY, J ;
KWONG, K ;
TANG, RQ ;
ZIEGLER, A .
PHYSICAL REVIEW B, 1985, 31 (04) :1796-1803
12