Magnetic droplets, a class of highly non-linear magnetodynamical solitons, can be nucleated and stabilized in nanocontact spin-torque nano-oscillators where they greatly increase the microwave output power. Here, we experimentally demonstrate magnetic droplets in magnetic tunnel junctions (MTJs). The droplet nucleation is accompanied by a power increase of over 300 times compared to its ferromagnetic resonance modes. The nucleation and stabilization of droplets are ascribed to the double-CoFeB free layer structure in the all-perpendicular MTJ which provides a low Zhang-Li torque and a high pinning field. Our results enable better electrical sensitivity in the fundamental studies of droplets and show that the droplets can be utilized in MTJ-based applications.
@article{arxiv.2012.05596,
title = {Observation of Magnetic Droplets in Magnetic Tunnel Junctions},
author = {Kewen Shi and Wenlong Cai and Sheng Jiang and Daoqian Zhu and Kaihua Cao and Zongxia Guo and Jiaqi Wei and Ao Du and Zhi Li and Yan Huang and Jialiang Yin and Johan Akerman and Weisheng Zhao},
journal= {arXiv preprint arXiv:2012.05596},
year = {2020}
}