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The distance between the sample surface and the fiber optic ring was about 8 cm.
This is because even under a natural state there is inevitably surface potential for the sample, forming an initial potential difference between the sample surface and the probe.
The oxide structures were formed electrochemically on the GaAs reactive surface by applying a negative bias voltage between the sample surface and the AFM probe.
The samples were mounted onto a translation stage, and different angles (from 0° to 67°) between the sample surface normal and the laser beam were chosen.
This is probably attributed to a uniform electric field between the sample surface and electrolyte solution by the enhanced electrical conductivity of the seed layer.
In the present study, the ΔR depends on the distance between the sample surface and the focal point of the Cassegrain mirror.
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The voltage induced between the sample surfaces due to the magnetoelectric effect (ME signal) was transmitted to the lock-in amplifier.
In order to mathematically determine the expected average temperature relationships between the sample surfaces, the maximum temperature, T, occurring at the end of the laser pulse (t p ), is determined through a one-dimensional model as follows [12, 26, 27]: Tleft(0, {t}_pright)=sqrt{frac{2 a}{pi^3{t}_p}fRrightKleft(1- Rright) P}{kf{ d}^2}} (2).
where V OUT is the output voltage (induced between the sample surfaces due to the magnetoelectric effect) registered by the lock-in amplifier, t is the thickness of the sample (in the form of disk), H DC is the magnitude of the DC magnetic field produced by an electromagnet, and H AC is the amplitude of the small sinusoidal magnetic field superimposed onto the DC magnetic field [6, 33].
Thus, the contact area between the tip and the sample surface is also extremely large.
where Ap is the projected contact area between the indenter and the sample surface at the maximum indentation load, Pmax.
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