Spin-wave nanograting coupler Haiming Yu 1,2, Georg Dürr 1, Rupert Huber 1, Michael Bahr 1, Thomas Schwarze 1, Florian Brandl 1, and Dirk Grundler 1 1.

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Presentation transcript:

Spin-wave nanograting coupler Haiming Yu 1,2, Georg Dürr 1, Rupert Huber 1, Michael Bahr 1, Thomas Schwarze 1, Florian Brandl 1, and Dirk Grundler 1 1 Physik-Department, Technische Universität München 2 Spintronics Interdisciplinary Center, Beihang University

Outline 1.Fundamentals on Spin Waves 2.Spin Waves nano-grating coupler 3.Sample Preparation 4.Further Analysis and conclusion

1.Fundamentals on Spin Waves

4 What is a spin wave?  Aligned spins  Starts to precess  Couple to their neighbours © Saitoh group

5 Dipolar spin waves Dipolar spin waves dispersion

6 Landau-Lifshitz equation: Spin waves - dipolar-exchange dipolar interaction exchange interaction

2. Spin Waves nano-grating coupler

Grating Coupler Effect in Plasmonics and Photonics Ekmel Ozbay, Plasmonics: Merging Photonics and Electronics at Nanoscale Science 311, 189 (2006); X. Chen et al. Opt. Lett. 36, 796 (2011).

Magnonic Grating Coupler λ ~ 1 μm λ ~ 10 mm

Key Results

3. Sample Preparation

Dot Structure 1.E-beam lithography 2.Ion beam milling 3.Evaporation of Py or Co (without taking it from the vacuum chamber!) 4.Lift-off process Py (25 nm) 48 nm 15 nm CoFeB 300 nm

Integrate Spin Wave Antennae Coplanar Waveguide (CPW) 1.Al 2 O 3 (5 nm) using Atomic Layer Deposition 2.E-beam Lithography for 4 Integrated Gold CPWs CPW1 CPW2 CPW3CPW4 CPW1 CPW2 CPW3 CPW4

3. Spin-wave Measurements

VNA Setup The microwave current supplied by the VNA excites the spins through the oscillating magnetic field which surrounds the inner conductor

Angle 40mT

Spin-wave Modes Simulation Daemon-Eshbach mode dispersion Backward Volume mode dispersion d = 48 nm μ 0 M s = 1.8 T μ 0 H = 40 mT

“Crossing” modes

Omnidirectional Spin Wave Modes

4. Further Analysis

Lattice Constant Dependence

Material Dependence

5. Conclusion

Advantages and perspectives 1.Omnidirectional spin wave emission 2.Wave vector tuned by lattice constant 3.Engineered BMC by changing two materials for even larger spin wave enhancement 4.Interlock the phase of neighboring spin transfer torque nanooscillators

Thank you for your attention!

Magnonic Crystals (MCs) 1D MCAnti-Dot Lattices (ADLs) 2D Bicomponent MCs (BMCs)

Magnonic Grating Coupler in MCs

Material Dependence

Transmission BMC S34 Plane film S12

Out-of-plane

Proposed Magnonic Device Pufall, M. R. Rippard, W. H. Russek, S. E. Kaka, S. & Katine, J. A. Electrical measurement of spin-wave interactions of proximate spin transfer nanooscillators. Phys. Rev. Lett. 97, (2006).