University of Minnesota
School of Physics & Astronomy

Condensed Matter Sack Lunch Seminar

Friday, December 1st 2017
12:20 pm:
Speaker: Protyush Sahu
Subject: Spin Hall magnetoresistance in W/CFB bilayers
To be announced.

Heavy metal/ferromagnet (HM/FM) bilayers have garnered a lot of attention in recent years, owing to the rise of spintronics. These systems are central to the study of spin-orbit torque, originating from the interaction between spin polarized electrons from HM and magnetization of FM. This interaction can produce change in resistance of the device, which is strongly dependent on the relative orientation between electron spin and the magnetization, called spin Hall magnetoresistance (SMR). The relative change in MR is theoretically predicted to be strongly dependent on the spin Hall effect (SHE) in HM and the magnetic properties of FM. SHE in W is strongly dependent on the crystal phase, which was characterized by X-ray diffraction. We study and characterize SMR in Tungsten(W)/CoFeB(CFB) bilayers with perpendicular magnetic anisotropy at different thermal annealing temperatures using two different experimental technique. Stoner-Wolfharth model was used to explain deviations in our experimental data from the predicted behavior.

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