Tunneling magnetoresistance induced by controllable formation of Co filaments in resistive switching Co/ZnO/Fe structuresZhihuan Yang, Qingfeng Zhan, Xiaojian Zhu, Yiwei Liu, Huali Yang, Benlin Hu, Jie Shang, Liang Pan, Bin Chen and Run-Wei LiEPL, 108 5 (2014) 58004DOI: https://doi.org/10.1209/0295-5075/108/58004