Dynamics of the magneto structural phase transition in La(Fe0.9Co0.015Si0.085)13 observed by magneto-optical imaging

被引：15

作者：

Kuepferling, M. ^{[1
]}

Bennati, C. ^{[1
,2
]}

Laviano, F. ^{[2
]}

Ghigo, G. ^{[2
]}

Basso, V. ^{[1
]}

机构：

[1] Ist Nazl Ric Metrol INRIM, I-10135 Turin, Italy

[2] Politecn Torino, Dept Appl Sci & Technol, I-10129 Turin, Italy

来源：

JOURNAL OF APPLIED PHYSICS | 2014年 / 115卷 / 17期

关键词：

METAMAGNETIC TRANSITION;

D O I：

10.1063/1.4866880

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigate the temperature induced ferromagnetic to paramagnetic phase transition in Co substituted La(FexCoySi1-x-y)(13) with x = 0.9 and low Co content of y = 0.015 (T-c similar or equal to 200K) by means of magneto-optical imaging with indicator film and by calorimetry at very low temperature rates. We were able to visualize the motion of the ferromagnetic (FM)/paramagnetic (PM) front which is forming reproducible patterns independently of the temperature rate. The average velocity of the FM/PM front was calculated to be 10(-4) m/s during the continuous propagation and 4 x 10(-3) m/s during an avalanche. The heat flux was measured at low temperature rates by a differential scanning calorimeter and shows a reproducible sequence of individual and separated avalanches which occurs independently of the rate. We interpret the observed effects as the result of the athermal character of the phase transition. (C) 2014 AIP Publishing LLC.

引用

页数：3

共 17 条

[1] STUDIES OF HTSC CRYSTAL MAGNETIZATION FEATURES USING INDICATOR MAGNETOOPTIC FILMS WITH INPLANE ANISOTROPY [J].