Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 2: Focus Session: Antiferromagnetic Spintronics

MA 2.3: Invited Talk

Monday, March 20, 2017, 10:15–10:45, HSZ 01

Electronic and magnonic spin transport in antiferromagnets — Lamprini Frangou¹, Guillaume Forestier¹, Stephane Auffret¹, Serge Gambarelli², and •Vincent Baltz¹ — ¹SPINTEC (Univ. Grenoble Alpes / CNRS / INAC-CEA), F-38000 Grenoble, France — ²SYMMES (Univ. Grenoble Alpes / INAC-CEA), F-38000 Grenoble, France

Through spin-pumping experiments we investigated how spin currents can be injected, transmitted and converted in antiferromagnets and what is the influence of the magnetic order. Spin pumping results from the magnetization dynamics of a ferromagnetic spin injector, which pumps a spin current into an adjacent spin sink. This spin sink filters, absorbs and converts the current to an extent which depends on its interface and bulk spin-dependent properties. This can be recorded either through the changes induced in ferromagnetic damping or through direct electrical means by measuring the inverse spin Hall effect. Whether the transport regime is electronic or magnonic depends of the electrical nature of the spin-sink and how strongly injector and sink are coupled. Due to magnetic coupling transfer/sink and propagation of spin angular momentum involves magnons from the oscillating ferromagnet feeding into the antiferromagnet. Measurements of the spin penetration were obtained for several antiferromagnetic metals and insulators. Interestingly, spins propagate more efficiently in layers where the magnetic order is fluctuating rather than static. Magnonic spin transport is also more efficient than its electronic counterpart. The experimental data were compared to some of the recently developed theories.