MAGNETIC BISTABILITY IN A METAL-ION CLUSTER

被引:3775
作者
SESSOLI, R
GATTESCHI, D
CANESCHI, A
NOVAK, MA
机构
[1] UNIV FED RIO DE JANEIRO,INST FIS,BR-21944 RIO JANEIRO,BRAZIL
[2] UNIV FLORENCE,DEPT CHEM,I-50144 FLORENCE,ITALY
[3] CNRS,CTR RECH TRES BASSES TEMP,F-38042 GRENOBLE,FRANCE
关键词
D O I
10.1038/365141a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
MAGNETIC materials of mesoscopic dimensions (a few to many thousands of atoms) may exhibit novel and useful properties such as giant magnetostriction, magnetoresistivity and magnetocaloric effects1-4. Such materials also allow one to study the transition from molecular to bulk-like magnetic behaviour. One approach for preparing mesoscopic magnetic materials is to fragment bulk ferromagnets; a more controllable method is to take a 'bottom-up' approach, using chemistry to grow well defined clusters of metal ions5,6. Lis7 has described a twelve-ion manganese cluster in which eight of the Mn ions are in the +3 oxidation state (spin S = 2) and four are in the +4 state (S = 3/2). These ions are magnetically coupled to give an S = 10 ground state, giving rise to unusual magnetic relaxation properties8,9. Here we report that the magnetization of the Mn12 cluster is highly anisotropic and that the magnetization relaxation time becomes very long below a temperature of 4 K, giving rise to pronounced hysteresis. This behaviour is not, however, strictly analogous to that of a bulk ferromagnet, in which magnetization hysteresis results from the motion of domain walls. In principle, a bistable magnetic unit of this sort could act as a data storage device.
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收藏
页码:141 / 143
页数:3
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