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CAMP: Spin dynamics and transport studied by ferromagnetic resonance (FMR) in Y3Fe5O12 based heterostructures

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Hailong Wang, Ohio State University
When
07 April 2015 from 3:30 PM to 4:30 PM
Where
339 Davey Laboratory
Contact Name
Nitin Samarth
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Generation and manipulation of spin is of central importance in modern physics. This intense interest is driven in part by exciting new phenomena such as spin Hall effects and spin transfer torque as well as by the growth in new tools enabling microscopic studies. Built on the high-quality Y3Fe5O12 (YIG) films grown by our sputtering technique, we use ferromagnetic resonance (FMR) spin pumping technique to characterize the spin Hall angles for a number of 3d, 4d, and 5d nonmagnetic metals with widely varying spin-orbit coupling strengths and demonstrate that both atomic number and d-electron count play important roles in spin Hall physics. By inserting spacer layers with different magnetic properties, we report systematic study of spin transport in a series of six YIG/insulator/Pt trilayers where the insulators are diamagnetic (one), paramagnetic (one) and antiferromagnetic (AF) (four, having a wide range of ordering temperatures).  We observe remarkably robust spin transport in the AF insulators and a distinct linear relationship between the spin decay length in the insulator and the damping enhancement in the YIG, suggesting the critical role of magnetic correlations in magnetic insulators for spin transport. In the end, I will also describe our experiment using spin wave modes confined into microscopic volumes in a ferromagnetic film by the spatially inhomogeneous magnetic field of a scanned micromagnetic tip of a ferromagnetic resonance force microscope (FMRFM).  We have measured local spin transfer from the resonance region to surrounding areas across a clean field defined interface within an insulating ferrimagnetic YIG thin film.

1. H. L. Wang*, C. H. Du*, P. C. Hammel, and F. Y. Yang, Antiferromagnonic Spin Transport from Y3Fe5O12 into NiO, Phys. Rev. Lett. 132, 097202 (2014).  

2.  H. L. Wang*, C. H. Du*, P. C. Hammel, and F. Y. Yang, Spin Current and Inverse Anomalous Hall Effect in Ferromagnetic metals Probed by Y3Fe5O12-Based Spin Pumping, Appl. Phys. Lett. 104, 202405 (2014). 

3. H. L. Wang*, C. H. Du*, Y. Pu, R. Adur, P. C. Hammel, and F. Y. Yang, Scaling of spin Hall angle in 3d, 4d and 5d metals from Epitaxial Y3Fe5O12/metal spin pumping, Phys. Rev. Lett. 112, 197201 (2014).  

4. C. H. Du*, H. L. Wang*, Y. Pu, T. L. Meyer, P. M. Woodward, F. Y. Yang, and P. C. Hammel, Probing the Spin Pumping Mechanism: Exchange Coupling with Exponential Decay in Y3Fe5O12/barrier/Pt Heterostructures, Phys. Rev. Lett. 111, 247202 (2013). 

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