William C. Cain, Mark H. Kryder
IEEE Transactions on Magnetics
A sensor-stretcher designed for use in ion-implanted contiguous disk devices is described. The current activated stretcher forms part of a self-aligned circuit and is defined simultaneously with the propagation structure. The sensor is a thin Permalloy stripe, 100µm in length, adjacent to the stretch conductor. Detection of 1 µm diameter bubbles has been achieved at frequencies up to 146 kHz, over a 30-Oe (10 percent) bias field margin. The figure of merit, ΔV/V, for the detector was relatively independent of sensor width in the range 2.5–10.µm and was ∼0.30%; maximum output was ∼10 mV. Noise resulting from imperfect balance of active and dummy detector was found to be a problem in narrow detectors (<10 µm) due to high coercivity. However, the coercivity may be reduced substantially by in-situ passivation with a 70 Å Si layer. Stroboscopic observation of bubble stretching indicates expansion velocities of 20–90 m/s, (depending on drive) in representative EuTmGaIG/GdYTmGaIG composites. The stretch current pulse for reliable expansion is a function of the magnitude and phase of the in-plane rotating field and is typically 200 mA, 2.5 µs. © 1979 IEEE
William C. Cain, Mark H. Kryder
IEEE Transactions on Magnetics
H.J. Yu, Mark H. Kryder, et al.
IEEE Transactions on Magnetics
Ian L. Sanders
IEEE Transactions on Magnetics
Mark H. Kryder, A. Deutsch
Proceedings of SPIE 1989