| Description: | [DPS Seminar] Dr. M. Raju (Johns Hopkins University, USA) -- Magnetic skyrmions and their topological Hall effect in thin film multilayers -::~::- Join: https://meet.google.com/dfs-vguy-czr -::~::- |
| Date: | Wednesday, Feb 09, 2022 |
| Time: | 3 p.m. - 4 p.m. |
| Details: | Stabilization of nano-scale magnetic skyrmions at room temperature (RT) is essential for skyrmion based applications. Recent reports on skyrmion formation in thin films at RT are indeed a promising development [1-3]. The electrical signature of a skyrmion spin texture manifested by a topological Hall effect (THE) [4-5], is extensively used to characterize these particles. However, the factors controlling the magnitude of THE in technologically useful architecturesremain to be clarified [5-8]. Using detailed magnetotransport and magnetic force microscopy imaging of skyrmions in a series of carefully grown Ir/Fe/Co/Pt multilayers, we find that chiral spin fluctuations can result in a power-law divergence in topological Hall signal by up to three orders of magnitude, revealing the dominant role of skyrmion stability and configuration. Our results also reconcile the large discrepancy between topological Hall and magnetic imaging experiments reported in recent years for skyrmions in thin film heterostructures. |
| URL: | https://meet.google.com/dfs-vguy-czr |
| Calendar: | Seminar Calendar (entered by rajni) |