PhD Mid-term Seminar Series: In-plane Magnetic State Detection by Spin Hall Effect with Favorable Miniaturization
CIC nanoGUNE Seminars
- Speaker
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Inge Groen, Nanodevices Group
- When
-
2019/09/23
13:00 - Place
- nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
- Add to calendar
- iCal
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).