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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.47: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Non-local magnetoresistance in YIG/Pt nanostructures — •Tobias Wimmer^1,2, Sebastian Goennenwein^1,2,3, Kathrin Ganzhorn^1,2, Richard Schlitz^1,2, Matthias Pernpeintner^1,2,3, Matthias Althammer¹, Rudolf Gross^1,2,3, and Hans Huebl^1,2,3 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — ²Physik-Department, Technische Universität München, 85748 Garching, Germany — ³Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 München Germany

The spin Hall magnetoresistance (SMR) in ferrimagnetic insulator/normal metal heterostructures has been extensively studied in Yttrium Iron Garnet /Platinum (YIG/Pt) bilayer structures. Recently, a non-local analogue of the SMR has been discovered in YIG/Pt nanostructures with two parallel Pt strips separated by a few 100 nm. Owing to the spin Hall effect, a charge current flowing along one Pt strip will generate a transverse spin current. The latter can create or annihilate magnons in the ferrimagnet, depending on magnetization orientation. As a result, an electrically generated non-equilibrium magnon population diffuses within the ferrimagnet, generating a non-local voltage drop across the second Pt strip. We investigate the evolution of this non-local magnon mediated magnetoresistance with temperature, magnetic field strength and field orientation. Our results show that the mechanisms behind the spin Hall and the non-local magnetoresistance are qualitatively different.