A magnetic source imaging camera

Dolgovskiy, Vladimir; Fescenko, Ilja; Sekiguchi, N.; Colombo, Simone; Lebedev, Victor; Zhang, J.; Weis, Antoine

doi:10.1063/1.4958700

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Journal article

A magnetic source imaging camera

Dolgovskiy, Vladimir Physics Department, University of Fribourg, Switzerland
Fescenko, Ilja Physics Department, University of Fribourg, Switzerland - Institute of Atomic Physics and Spectroscopy, University of Latvia, Riga, Latvia
Sekiguchi, N. Physics Department, University of Fribourg, Switzerland - Department of Applied Physics, Tokyo University of Agriculture and Technology, Tokyo, Japan
Colombo, Simone Physics Department, University of Fribourg, Switzerland
Lebedev, Victor Physics Department, University of Fribourg, Switzerland
Zhang, J. Physics Department, University of Fribourg, Switzerland - College of Science, Harbin Engineering University, China
Weis, Antoine Physics Department, University of Fribourg, Switzerland

11.07.2016

Published in:

Applied Physics Letters. - 2016, vol. 109, no. 2, p. 023505

English We describe a magnetic source imaging camera (MSIC) allowing a direct dynamic visualization of the two-dimensional spatial distribution of the individual components Bx(x,y), By(x,y) and Bz(x,y) of a magnetic field. The field patterns allow—in principle— a reconstruction of the distribution of sources that produce the field B→ by inverse problem analysis. We compare experimentally recorded point-spread functions, i.e., field patterns produced by point-like magnetic dipoles of different orientations with anticipated field patterns. Currently, the MSIC can resolve fields of ≈10 pT (1 s measurement time) range in a field of view up to ∼20 × 20 mm2. The device has a large range of possible applications. As an example, we demonstrate the MSIC's use for recording the spatially resolved Néel magnetorelaxation of blocked magnetic nanoparticles.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language