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In‐phase and out‐of‐phase temperature oscillation measured during a 3ω experiment on 1200RPM at 300 K. Within the upper and lower frequency limit, the in‐phase temperature oscillation is linear in logarithmic frequency. These limits were calculated from the room temperature thermal diffusivity of 4 mm2 ·s–1, a heater width 2b of 20 μm, and the sample thickness of 0.8 mm.
