Methodology

Micro-focused BLS spectroscopy is based on the inelastic scattering of photons by magnons and enables the frequency-, time-, wavenumber- and spatially-resolved detection of spin waves and their quanta magnons as well as phonons. BLS is one of the most powerful instruments in the field of magnonics for the study of linear and nonlinear spin-wave dynamics.

• Frequency range: 1 GHz-1THz
• Frequency resolution: 50 MHz
• Spatial resolution: 400 nm
• Time resolution: 1 ns
• Magnetic field up to 0.4 T (IP/OOP)
• Laser: 457 nm, 100 mW

Contact person: Dr. K. Levchenko
Location: Boltzmanngasse 5, ground floor, 3e29b        
Phone: +43-1-4277-739-92

Multi-channel vector network analyzer (VNA) combined with a bottom loading dilution refrigerator. The cryostat is equipped with a superconducting vector magnet, four conventional transmission lines, four superconducting transmission lines, direct optical access via 3 windows and a fiber port. The setup is used for the excitation and detection of magnons at millikelvin temperatures down to the single-magnon level quantum range.   

• Base temperature 10 mK
• Cooling Power 14µW/300µW @ 20mK/100mK
• 9-1-1 T superconducting vector magnet
• VNA rated up to 70 GHz
• Active vibration stabilisation

Responsible person: Dr. S. Knauer
Location: Boltzmanngasse 5, first floor, 3141
Phone: +43-1-4277-739-93

A universal microwave characterization station is used for FMR, PSWS and all-electric spin transport measurements (ISHE, SSE, etc.) to characterize magnetic materials and to study the magnon and spin transports in magnetic nano-networks.

• Room temperature (RT)
• Frequency range: DC -20 GHz
• Max magnetic field: 2.1 T
• Frequency resolution: 1 Hz
• Contains microprobes station
• Equipped with VNA, spectrum analyser, WM and lock-in amplifiers, ...

Responsible person: Dr. K. Levchenko
Location: Boltzmanngasse 5, ground floor, 3e29c
Phone: +43-1-4277-739-91

The magnetic state of a sample may be examined using the magneto-optic Kerr effect (MOKE), which is the rotation and distortion of the polarisation plane of light when it is reflected from a magnetised material. Super Nyquist sampling (SNS) is a form of time resolution (TR), which comes from the synchronisation of a pulsed probe laser with the oscillation of a spin wave. This allows us to see how the magnetic state changes over time.

• 20 GHz excitation limit
• 1 T out of plane field
• 180 fs pulse length at 515 nm
• Spatial resolution: 400 nm
• Time resolution: 50 ps

Contact person: Dr. K. Levchenko
Location: Boltzmanngasse 5, ground floor, 3e29a       
Phone: +43-1-4277-739-92

Physical Property Measurement System (PPMS) is a universal setup for characterizations and transport measurements in the broad range of temperatures and fields. It has a series of insets for vibrating sample magnetometery (VSM), ferromagnetic resonance (FMR), AC susceptibility, electrical, spin and thermal transport.

• Temperatures from 1.9 K to 400 K
• Magnetic field up to 9 T
• Frequency up to 40 GHz
• Fully automatised

Reponsible person: David Schmoll
Location: Boltzmanngasse 5, basement, 3K11a
Phone: +43-1-4277-739-50

Physics of Functional Materials website: https://fun.univie.ac.at/