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- Title
All Perpendicular Spin Nano-Oscillators with Composite Free Layer.
- Authors
Wei, Jiaqi; Cao, Kaihua; Cui, Hushan; Shi, Kewen; Cai, Wenlong; Li, Huisong; Jing, Yang; Zhao, Chao; Zhao, Weisheng
- Abstract
Owing to improved thermal stability and scalability, materials with perpendicular magnetic anisotropy (PMA) are extremely attractive. The all perpendicular magnetic tunnel junction (p -MTJ) devices are primarily devoted to spin transfer torque (STT)-induced switching and few works report their microwave emission. Here, we demonstrate the basic results of RF function in nanoscale p -MTJ which has two different thickness free layers separated by atom-thick tungsten insertion. The ultrathin W spacer layer not only enables the two CoFeB free layers precess as a single layer but also greatly enhances the PMA which further induces high-emission frequency. The all perpendicular spin transfer torque nano-oscillator (STNO) exhibited high frequency (7.6 GHz) and large current modulation capability of 0. 8 6 GHz ⋅ mA − 1 at moderate external magnetic field. Along with our previous work on STT switching utilizing the similar stack, such a multifunctional structure could bring low cost solutions to Internet of Things (IoT) network applications.
- Subjects
MAGNETRON sputtering; PERPENDICULAR magnetic anisotropy; SPIN transfer torque; MAGNETIC tunnelling; TANTALUM
- Publication
SPIN (2010-3247), 2019, Vol 9, Issue 3, pN.PAG
- ISSN
2010-3247
- Publication type
Article
- DOI
10.1142/S2010324719400101