M(H) shape reconstruction using magnetic spectroscopy

• Published in: Journal of magnetism and magnetic materials Vol. 324; no. 6; pp. 895 - 902
• Main Authors: Teliban, Iulian, Chemnitz, Steffen, Thede, Claas, Bechtold, Christoph, Mozooni, Babak, Krause, Hans-Joachim, Quandt, Eckhard
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-03-2012; Elsevier
• Subjects: Analysing. Testing. Standards; Applied sciences; Exact sciences and technology; Frequency mixing technique; General equipment and techniques; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Magnetic materials; Magnetic sensors; Magnetic spectroscopy; Magnetization; Magnetization curve measurement; Magnetization curves; Mathematical models; Metals. Metallurgy; Nondestructive testing; Physics; Reconstruction; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing; Spectra; Strain; Strain monitoring; Magnetization curve measurement; Magnetic sensors; Strain monitoring; Frequency mixing technique; Magnetic spectroscopy; Magnetization; Experimental device; Superparamagnetism; Kerr magnetooptical effect; Magnetic measurement; Deformation measurement; Mathematical model; Non destructive test; Monitoring; Frequency mixing; Nanocrystal; Non contact measurement
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2011.10.016

Knowledge about the magnetization behavior M(H) is crucial for the use of magnetic materials in engineering applications. To date many systems exist that are able to measure the magnetization behavior, e.g. VSM, VCM, MOKE. In addition to their huge costs, complex and space-consuming measurement setup, large amount of preparatory work and restricted surface measurements are handicaps which restrict their field of application. Furthermore, the influence of additional physical quantities such as temperature, strain or pressure can only be investigated with great efforts. These influences are, however, of major importance in the development of magnetic sensor systems that are based on the change in magnetic properties.
In this paper, a new measurement principle based on a frequency mixing technique is introduced for investigation of the shape of the magnetization curve of soft non-hysteretic magnetic materials. Based on the Taylor expansion of the magnetization curve and the spectral investigation of the inductively detected signal, a mathematical model for the reconstruction of M(H) is proposed. The model is both numerically and experimentally verified. It is shown that the magnetization curve of a nanocrystalline soft magnetic material used in this study can be reconstructed very accurately and the influence of an additional parameter, i.e. strain, can be investigated in detail as well.
► Non-contact determination of magnetization curve shape of soft magnetic materials. ► Alternative measurement technique to VSM/VCM or MOKE. ► Mathematical groundwork about the relation between magnetic spectroscopy and magnetic permeability. ► Strain monitoring using magnetic spectroscopy.