Macroscopic quantum tunneling of magnetization of single ferrimagnetic nanoparticles of barium ferrite

被引：196

作者：

Wernsdorfer, W

Orozco, EB

Hasselbach, K

Benoit, A

Mailly, D

Kubo, O

Nakano, H

Barbara, B

机构：

[1] CNRS, CTR RECH TRES BASSES TEMP, F-38042 GRENOBLE, FRANCE

[2] CNRS, MICROSTRUCT & MICROELECT LAB, F-92220 BAGNEUX, FRANCE

[3] TOSHIBA CO LTD, ISOGO KU, YOKOHAMA, KANAGAWA 235, JAPAN

[4] TOSHIBA GLASS CORP, YOSHIDA, SHIZUOKA 421, JAPAN

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.79.4014

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Presented are switching field measurements of individual ferrimagnetic and insulating BaFeCoTiO nanoparticles containing about 10(5) mu(B) at very low temperatures (0.1-6 K). For temperatures higher than 0.4 K, the quantitative agreement with the Neel-Brown theory of thermal activated magnetization reversal allowed us to identify unambiguously the magnetization reversal of uniform rotation. Below 0.4 K, strong deviations from this model are evidenced which are quantitatively in agreement with the predictions of the theory of macroscopic quantum tunneling of magnetization in the low dissipation regime.

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页码：4014 / 4017

页数：4

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