Method for measuring spin seebeck coefficient of magnetic nanowire

Abstract

The invention discloses a method for measuring spin seebeck coefficients of a magnetic nanowire. The method comprises the following steps: placing the magnetic nanowire on a resistance heating platform, and respectively measuring to obtain temperature resistance coefficients of platinum electrodes Pt1 and Pt2; focusing femtosecond laser or picosecond laser on the surface of the platinum, Pt1 or Pt2 electrode, measuring the resistance of the platinum electrodes Pt1 and Pt2, calculating the temperature of the platinum electrodes Pt1 and Pt2 according to the measured temperature resistance coefficients of the platinum electrodes Pt1 and Pt2, and calculating the temperature difference delta T between the platinum electrodes Pt1 and Pt2; by changing the magnetic field applied to the magnetic nanowire, the potential of the magnetic moment of the magnetic film on the magnetic nanowire in an anti-parallel state (AP) and a parallel state (P) is measured, and the spin seebeck coefficient of the magnetic nanowire is calculated. The measurement means is simpler and faster, the generated temperature gradient is larger, other secondary effects are avoided, and measurement is more accurate.

Description

technical field [0001] The invention relates to a method for measuring magnetic nanowire spin Seebeck coefficient, which belongs to the technical field of measurement and sensing. Background technique [0002] The combination of spintronics and thermoelectrics in magnetic nanostructures can be used to develop future pure spin-based devices with applications in sensing and magnetic data storage. The emerging field of spin-thermotronics is facilitated by recent findings showing that pure spin currents can be generated via thermal gradients. However, a deep understanding of thermoelectric voltage signals in nanoscale magnetic structures is still required. [0003] The spin-related Seebeck coefficient is an important research content in spin thermoelectronics, and how to accurately measure the coefficient is the difficulty of this research. At present, in order to measure the spin-dependent Seebeck coefficient in magnetic nanowires, a layer of heating resistance layer is usual...

AI Technical Summary

Problems solved by technology

However, there are three disadvantages in this method. First, two layers of resistance heating films need to be coated on both ends of the magnetic nanowires, which increases the complexity of the magnetic nanowires. Second, due to the resistance wire heating, the temperature difference formed is limited. Third, The resistance heating process will bring other secondary effects, such as the additional magnetic field generated by the heating current, etc. Therefore, the present invention proposes the method of using laser heating, which effectively avoids the three disadvantages of the measurement process

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