Monitoring of Superparamagnetic Particle Sizes in the Langevin Law Regime

Table 1

Saturation magnetizations measured in MB curves (first part of the table). Results of MB curve fitting obtained with lognormal size distribution fitting (LDF) and simple Langevin fitting (SLF) (i.e., no size distribution); size distribution from TEM.

	MB		S1	S2	S3	S4
	100 K		114.1 (3.4)	114.8 (3.4)	103.9 (3.1)	104.4 (3.1)
	200 K		104.8 (3.1)	107.3 (3.2)	98.0 (2.9)	97.3 (2.9)
	275 K		99.4 (3.0)	100.0 (3.0)	92.2 (2.8)	89.3 (2.7)
	300 K		95.1 (2.9)	96.4 (2.9)	89.0 (2.7)	87.1 (2.6)
	315 K		93.3 (2.8)	94.4 (2.8)	86.9 (2.6)	85.0 (2.5)
LDF	100 K		2.05 (7)	2.67 (7)	2.27 (7)	1.86 (5)
			0.4176 (43)	0.2956 (18)	0.4182 (38)	0.4704 (27)
	200 K		2.95 (8)	3.22 (8)	2.95 (8)	2.45 (7)
			0.2910 (31)	0.2132 (25)	0.3859 (30)	0.4184 (29)
	275 K		3.41 (9)	3.46 (9)	3.88 (11)	2.92 (9)
			0.2084 (30)	0.1684 (35)	0.3049 (27)	0.3683 (34)
	300 K		3.52 (10)	3.53 (9)	3.96 (11)	2.99 (9)
			0.2057 (35)	0.1572 (39)	0.2971 (26)	0.3640 (37)
	315 K		3.59 (10)	3.60 (10)	4.08 (11)	3.07 (9)
			0.1803 (41)	0.1443 (49)	0.2859 (24)	0.3488 (35)
SLF	100 K		3.30 (9)	3.37 (9)	3.62 (10)	3.42 (10)
	200 K		3.77 (10)	3.68 (9)	4.42 (12)	4.04 (11)
	275 K		3.90 (10)	3.78 (9)	5.00 (13)	4.35 (11)
	300 K		3.94 (10)	3.82 (9)	5.05 (13)	4.42 (11)
	315 K		3.97 (10)	3.85 (9)	5.12 (13)	4.43 (11)
	TEM		3.170 (26)	3.228 (30)	3.622 (43)	3.32 (5)
			0.183 (8)	0.227 (9)	0.247 (12)	0.291 (16)