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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Chen, C.C. Lin, J.Y. Horng, L. Yang, J.S. Isogami, S. Tsunoda, M. Takahashi, M. Wu, J.C. |
| Copyright Year | 1965 |
| Abstract | Nanostructured magnetic tunnel junction rings (MTJ) based on CoFeB free layer were fabricated to investigate the corresponding magnetization reversal processes. The dimensions of the MTJ rings were with outer diameter/linewidth of 1 mum/100 nm and 0.7 mu m/100 nm , respectively, in which the fabrication was carried out by a top-down technique in combination with electron beam lithography, ion-milling and etch-back processes. Double transition processes in magnetoresistance (MR) responses are observed in these nanostructured MTJ rings. With considering the surface roughness, an OOMMF simulation was employed to explore the magnetization evolution. The simulated hysteresis loops are consistent with the MR behaviors, unfolding that the magnetic switching process initiates from the forward to reversed onion states through an incomplete vortex state. This two-step switching behavior is reasonably assumed to be due to a pinning site resulting from the surface roughness in a region of the ring. In addition, a series of in situ magnetic force microscopy images extracted from nanostructured MTJ rings reveals the similar magnetization evolution with the simulated results. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 3546 |
| Ending Page | 3549 |
| Page Count | 4 |
| File Size | 258172 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 45 |
| Issue Number | 10 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2009-10-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Magnetization reversal Magnetic tunneling Rough surfaces Surface roughness Fabrication Electron beams Lithography Etching Magnetoresistance Magnetic hysteresis ring Magnetic force microscopy (MFM) magnetic tunnel junctions (MTJs) magnetization reversal magnetoresistance |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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