A focused magneto-optical Kerr magnetometer for Barkhausen jump observations

被引：28

作者：

Puppin, E

Vavassori, P

Callegaro, L

机构：

[1] Politecn Milan, Dipartimento Fis, Ist Nazl Fis Mat, I-20133 Milan, Italy

[2] Univ Ferrara, Dipartmento Fis, Ist Nazl Fis Mat, I-44100 Ferrara, Italy

[3] Ist Elettrotecn Nazl Galileo Ferraris, I-10135 Turin, Italy

[4] Ist Nazl Fis Mat, Elect Metrol Dept, I-10135 Turin, Italy

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2000年 / 71卷 / 04期

关键词：

D O I：

10.1063/1.1150532

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We describe a modified version of a magneto-optical Kerr magnetometer which allows measuring the hysteresis loop of a specific portion of the sample surface. The diameter of the sampled area can be optically tuned from several mm down to 15 mu m. High quality hysteresis loops can be measured in a few seconds. Strong fluctuations are observed when the spot diameter is reduced to a few hundred microns or less. These fluctuations are related to the well-known Barkhausen noise here investigated for the first time in a systematic way using optical techniques. Preliminary data for epitaxial Fe grown on MgO are presented. (C) 2000 American Institute of Physics. [S0034-6748(00)01904-3].

引用

页码：1752 / 1755

页数：4

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