Abstract
Large-amplitude magnetic-oscillations on a current-tunable microwave oscillator at low currents without the need for an applied magnetic field are demonstrated. Two magnetic layers are used as a polarizer-analyzer combination for electron spin, similar to light passing through a set of polarizing filters. A parallel state of alignment of polarizer and analyzer magnetizations shows that there is a high transmission of spin-polarized electrons, which results in low-resistance state. The torque on a microwave oscillator causes a dynamical response of the system, leading to a reversal of magnetization direction and high-frequency precision of the magnetization. Layers that intrinsically prefer a perpendicular polarization are used to create perpendicular magnetization in the free layers in an oscillator. Large microwave signals in a current-tunable oscillator are generated that increase output level of the oscillator.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 399-400 |
| Number of pages | 2 |
| Journal | Nature Materials |
| Volume | 6 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 2007 |
ASJC Scopus subject areas
- General Chemistry
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering