PhD Mid-term Seminar Series: In-plane Magnetic State Detection by Spin Hall Effect with Favorable Miniaturization

CIC nanoGUNE Seminars

Speaker

Inge Groen, Nanodevices Group

When

2019/09/23
13:00

Place

nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian

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Spin-orbitronic devices exploit the coupling between spin and orbital momentum of electrons.1 A well-established device is a non-local spin valve with spin absorption that can be used to generate and detect pure spin currents.2 Here, we present a local spin injection device which allows for conversion of a spin-polarized state into an electric signal, utilizing spin-orbit coupling (SOC). The advantage of these devices compared to non-local devices is the increase of the signal strength. Our approach opens up exciting opportunities towards the implementation of spin-orbit-based logic circuits.3 The local spin injection device consists of (1) a ferromagnetic (FM) electrode, allowing for the injection of a spin-polarized current, and (2) a T-shaped electrode made of a material with strong SOC, realizing the spin-to- charge conversion through the inverse spin Hall effect.4 Our devices are vertical junctions composed of CoFe (FM) and Pt (SOC), forming a cross-shaped geometry. In this study, the dimension of the electrodes are investigated to optimize both the spin injected signal as well as the spin-to-charge efficiency. We demonstrate a favourable miniaturization of the spin-orbit- based readout of a magnetic state. The scaling law allows us to obtain a giant signal by spin Hall effect in CoFe/Pt nanostructures and quantify an effective spin-to-charge conversion rate for the CoFe/Pt system. _ _ 1. Kuschel, T. & G. Reiss, _Nat. Nanotechnol._ **10,** 22–24 (2014). 2. Sagasta, E. _et al._ , _Phys. Rev. B_ **94,** 060412(R) (2016). 3. Manipatruni, S., arXiv:1512.05428v2 (2017). 4. Pham, V. T. _et al.,_ _Nano Lett._ **16,** 6755–6760 (2016).