DeXin Wang

Tuning Magnetic Microstructures of Reference Layer in Magnetic Tunneling Junctions

Magnetic microstructures in the reference layer in magnetic tunneling junctions (MTJs) are tuned by a reversal field under ambient conditions to investigate their effects on the magnetoresistance (MR) and the exchange coupling field (HE) between the reference layer and the free layer. Magnetization changes in the reference layer can be probed by measuring minor MR loops. The results show the HE of the minor MR loops versus the applied reversal field changes from negative to positive and crosses zero. These results can be explained by the magnetic inhomogeneities at the interface between anti-ferromagnetic/pinned-ferromagnetic layers, which causes the partial magnetization reversal in the reference layer

Detection of Continuous Spinwaves Along Magnetic Nanostripes Using Magnetoresistive Devices

In this study, we have theoretically investigated the scheme to detect continuous spinwaves using magnetoresistive devices. First, the spinwaves along a magnetic nanostripe related to this detection scheme have been characterized using a linearization approach on the Landau-Lifshitz-Gilbert equation. Then, the frequency (wavelength) responses of the magnetoresistive devices have been derived from the giant- or tunneling-magnetoresistive effect. The frequency (wavelength) responses have been compared with those of the conventional detection methods using microstrip lines or coplanar waveguides. Finally, we have qualitatively analyzed the impact of noise in spinwave detection, from which this detection scheme can be improved.