SIZE-DEPENDENT CURIE-TEMPERATURE IN NANOSCALE MNFE2O4 PARTICLES

被引：338

作者：

TANG, ZX

SORENSEN, CM

KLABUNDE, KJ

HADJIPANAYIS, GC

机构：

[1] KANSAS STATE UNIV AGR & APPL SCI,DEPT CHEM,MANHATTAN,KS 66506

[2] UNIV DELAWARE,DEPT PHYS & ASTRON,NEWARK,DE 19716

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 25期

关键词：

D O I：

10.1103/PhysRevLett.67.3602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have determined the Curie temperature T(c) of ferrimagnetic MnFe2O4 nanoscale particles by means of direct measurement of the magnetization. A considerable enhancement in T(c) compared to the bulk was observed for particles in the size range 7.5 to 24.4 nm. At d = 7.5 nm, T(c) is 97 K higher than for the bulk material. The shift in Curie temperature is well described by the finite-size-scaling formula [T(c)(d)-T(c)(infinity)]/T(c)(infinity) = (d/d0)-1/v with v = 0.71 +/- 0.07 and d0 = 2.0 nm.

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页码：3602 / 3605

页数：4

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