What happened when very small change in blocking temperature when we increase frequency and why the spin flip time of any material is zero?

06 March 2017 1 4K Report

when frequency increase from 1 to 1000Hz and very small change in blocking temperature.

in this blocking temperature is change very small with respect to frequency which change from 92 to 93 K with 1 to 1000 Hz

and i fit arhenius law in which spin flip time is 0s and expectation energy is very high why?????

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