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Size-driven magnetic transitions in nanoparticles
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Image of FIG. 1.
FIG. 1.

(a) XRD spectra of LCMO12, LCMO25, and LCMO42 samples, annealed at , , and , respectively. (b) Rietveld plot for LCMO42 sample. The data points are indicated by open circles, the calculated and difference patterns are shown by solid lines.

Image of FIG. 2.
FIG. 2.

(a) TEM bright field and (b) high resolution images of the LCMO12 sample.

Image of FIG. 3.
FIG. 3.

Temperature dependence of ZFC (open symbols) and FC (solid symbols) magnetization of LCMO12 (a), LCMO25 (b), and LCMO42 (c) samples in magnetic field . Inset to (b) shows and of LCMO25 sample measured in magnetic field .

Image of FIG. 4.
FIG. 4.

[(a), (b), and (c)] Temperature dependence of real component of ac-susceptibility of LCMO12, LCMO25, and LCMO42 samples measured during heating at different frequencies of 10, 100, 1000, and 10000 Hz and in magnetic ac field of 10 Oe. [(d), (e), (f)] curves for LCMO12, LCMO25, and LCMO42 samples, registered during heating, at 10, 100, 1000, and 10000 Hz in magnetic field of 10 Oe. Inset to (a) shows vs dependence, describing critical slowing down of the spin dynamics.

Image of FIG. 5.
FIG. 5.

(a) Magnetic field dependences of magnetization measured at for LCMO NP samples. (b) Resulting magnetization vs curve, obtained after substracting the contribution of AFM core determined at for ZFC.

Image of FIG. 6.
FIG. 6.

(a) Field dependence of magnetization of LCMO25 sample at 10 K measurerd after ZFC and FC in . (b) The hysteresis loop measured at 10 K after FC with indication of EB parameters. denotes the remanent magnetization. (c) Field dependence of magnetization at various temperatures measured after FC.

Image of FIG. 7.
FIG. 7.

(a) Temperature dependence of spontaneous magnetization and remanent magnetization for LCMO12 and LCMO42 samples, extracted from hysteresis loops recorded at various temperatures. Temperature dependence of (b) and and (c) for LCMO12 and LCMO42 samples after FC in 15 kOe.

Image of FIG. 8.
FIG. 8.

Temperature dependence of thermoremanent magnetization for LCMO12, LCMO25, and LCMO42 samples.

Image of FIG. 9.
FIG. 9.

Time variation in magnetization after subsequent cooling to 10 K in magnetic field of 5 kOe for LCMO12 sample.


Generic image for table
Table I.

Crystalline size and lattice parameters of the samples annealed at various temperatures.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Size-driven magnetic transitions in La1/3Ca2/3MnO3 nanoparticles