Magnetoelectric bistabilities in ferromagnetic resonant tunneling structures

Self-sustained magnetoelectric oscillations in magnetic resonant tunneling structures.

The dynamic interplay of transport, electrostatic, and magnetic effects in the resonant tunneling through ferromagnetic quantum wells is theoretically investigated. It is shown that the carrier-mediated magnetic order in the ferromagnetic region not only induces, but also takes part in intrinsic, robust, and sustainable high-frequency current oscillations over a large window of nominally steady...

Ferromagnetic Resonant Tunneling Diodes: Physics and Applications

Dedication To my family. v Acknowledgements I would like to acknowledge, foremost, my advisor Prof. Sanjay Banerjee. I should thank him for providing me the opportunity to pursue graduate study, his constant support for the last six years – both intellectual and material, and the flexibility he afforded to me to define and follow my interests. Second, I would like to acknowledge my co-advisor P...

Magnetoelectric interactions in ferromagnetic-piezoelectric layered structures: Phenomena and devices

Layered magnetostrictive-piezoelectric structures are multifunctional due to their dual-responsiveness to mechanical and electromagnetic forces. Here, we discuss studies of magnetoelectric (ME) interactions in ferrite-lead zirconate titanate (PZT) and terfenol-PZT material couples. Key findings include: (1) the observation of a giant lowfrequency ME effect in the layered systems; (2) data analy...

Theory of digital magnetoresistance in ferromagnetic resonant-tunneling diodes

We propose a ferromagnetic spintronic system, which consists of two serial connected resonant-tunneling diodes. One diode is nonmagnetic whereas the other comprises a ferromagnetic emitter and quantum well. Using a self-consistent coherent transport model we show that the current-voltage characteristic of the ferromagnetic diode can be strongly modulated by changing the relative orientation of ...

9 Resonant Tunneling in Quantum Structures