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Magnetoanisotropic Andreev reflection in ferromagnet-superconductor junctions
Petra Högl1, Alex Matos-Abiague1,2, Igor Žutić2
1Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany.
Physical Review Letters
|September 26, 2015
Summary
Andreev reflection spectroscopy in ferromagnet-superconductor junctions reveals controllable spin polarization. Changing magnetization orientation and spin-orbit fields allows for precise control of Andreev reflection, enabling sensitive probing of interfacial properties.
Area of Science:
- Condensed matter physics
- Spintronics
- Quantum phenomena
Background:
- Andreev reflection spectroscopy is crucial for probing spin polarization in ferromagnet-superconductor (FS) junctions.
- Interfacial spin-orbit fields, such as Rashba and Dresselhaus, significantly influence electronic transport properties.
Purpose of the Study:
- To theoretically investigate spin-polarized transport in FS junctions with Rashba and Dresselhaus spin-orbit fields.
- To demonstrate the control of Andreev reflection by manipulating magnetization orientation.
Main Methods:
- Theoretical modeling of spin-polarized transport in FS junctions.
- Analysis of Andreev reflection in the presence of interfacial spin-orbit interactions.
Main Results:
- Andreev reflection can be precisely controlled by altering the magnetization orientation.
- A significant in-plane and out-of-plane magnetoanisotropy in junction conductance is predicted.
- In the half-metal limit, magnetoanisotropic Andreev reflection depends solely on spin-orbit fields.
Conclusions:
- Andreev reflection spectroscopy offers a sensitive method for characterizing interfacial spin-orbit fields in FS junctions.
- The findings provide a pathway for designing and controlling spintronic devices based on FS heterostructures.
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