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Electrical, magnetic and spintronic properties from DC to HF
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The laboratory is equipped with instrumentation for measuring the following properties:

  • Magnetoresistance (anisotropic, spin Hall, etc.), and spin-orbit torque efficiency. Electrical resistance measurements are performed with micrometric probes (100 and 150 µm pitch) with a DC pulsed current applied with a Keithely 6221 source meter, whereas the measurement is performed with a Keithley 2182A nanovoltmeter. The magnetic field is applied by means of a 2D setup (4 poles, planar) up to 0.2 T at room temperature, or a 3D setup up to 0.5 T (variable temperature from 77 to 400 K), or an electromagnet up to 1 T at room temperature;
  • Ferromagnetic resonance, magnetic permeability, scattering parameters of electromagnetic waves, dispersion relation of spin waves: the measurement of the Sij scattering parameters is performed with a two-ports vector network analyser (VNA, Agilent) in the 10 MHz - 20 GHz frequency range, by exploiting GSG or GSGSG microprobes, as a function of the magnetic field;
  • High frequency magnetoresistance, magnetisation dynamics in MTJs (vortices, etc.): the measurement is performed with an Agilent spectrum analyser in the 3 Hz - 50 GHz frequency range, with GSG or GSGSG microprobes. Resonance for spin-(orbit)-torque is generated by a bias-Tee splitting the DC from the HF signals, and by a DC current source in the mA range, e.g. Keithley 6221 source meter.