TABLE I.

Estimated Néel relaxation time constants for 2 nm and 5 nm diameter MNPs, and for 27 nm MNP aggregates, which comprise the Dartmouth MNP system (see Figure 1).

MNP diameter (nm)	${\tau }_0={10}^{-9}\hspace{0.17em}\left(\mathrm{s}\right)$		${\tau }_0={10}^{-10}\hspace{0.17em}\left(\mathrm{s}\right)$
	${\tau }_n$(s)	f (Hz)	${\tau }_n$(s)	f (Hz)
2	1.01 × 10−9	1.58 × 108	1.0 × 10−10	1.58 × 109
5	1.16 × 10−9	1.37 × 108	1.2 × 10−10	1.37 × 109
27	18.7	8.5 × 10−3	1.87	8.5 × 10−2