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Analysis of Spin Valve Tunneling Magnetoresistance Sensor for Eddy Current Nondestructive Testing  

Kim, Dong-Young (Department of Physics, Andong National University)
Yoon, Seok-Soo (Department of Physics, Andong National University)
Lee, Sang-Hun (Department of Radiological Science, Kaya University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.28, no.6, 2008 , pp. 524-530 More about this Journal
Abstract
The spin valve tunneling magnetoresistance (SV-TMR) sensor performance is analyzed using Stoner-Wohlfarth model for the detection of eddy current signals in nondestructive testing applications. The SV-TMR response in terms of the applied AC magnetic field dominantly generates the second harmonic amplitude in hard axis direction. The second harmonic eddy current signal detection using SV-TMR sensor shows higher performance than that of the coil sensor at lower frequencies. The SV-TMR sensor with high sensitivity gives a good solution to improve the low frequency performance in comparison with the inductive coil sensors. Therefore, the low frequency eddy current techniques based on SV-TMR sensors are specially useful in the detection of hidden defects, and it can be applied to detect the deeply embedded flaws or discontinuities in the conductive materials.
Keywords
Eddy Current; Magnetoresistance; Nondestructive Testing; Harmonics; Flaw Detection;
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