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Size-dependent scaling of exchange bias in NiFe2O4/NiO nanogranular systems synthesized by a phase separation method
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10.1063/1.4800529
/content/aip/journal/jap/113/14/10.1063/1.4800529
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/14/10.1063/1.4800529

Figures

Image of FIG. 1.
FIG. 1.

The XRD patterns of (1−x)NiO/xNiFe2O4 (x = 0.05) nanocomposites sintered at different temperatures.

Image of FIG. 2.
FIG. 2.

The TEM and SAED micrographs of samples (a) S1, (b) S3, (c) S5, (d) S6, (c) S7, (d) the HRTEM image for S3.

Image of FIG. 3.
FIG. 3.

(a) Room temperature magnetic hysteresis for samples S1 (□), S3 (▽), S5 (△), and S6 (○). (b) Variation of the coercivity (HC) and magnetization (MS) with NiFe2O4 particle size (D NFO). (c) Variation of total anisotropy constant (K eff) with NiFe2O4 particle size (D NFO).

Image of FIG. 4.
FIG. 4.

Temperature dependence of ZFC and FC magnetizations at 10 kOe for samples (a) S1, (b) S2, (c) S3, (c) S4, (c) S6, and (d) S7.

Image of FIG. 5.
FIG. 5.

Temperature dependence of ZFC and FC magnetizations at different magnetic fields for sample S3.

Image of FIG. 6.
FIG. 6.

Field dependence of the transition Tirr, as determined by the separation of ZFC and FC curves for sample S3, showing the AT lines.

Image of FIG. 7.
FIG. 7.

Time dependence of the magnetization in applied fields of alternated sign after a ZFC process for sample S3.

Image of FIG. 8.
FIG. 8.

The ZFC and FC hysteresis loops measured at 10 K after field cooling in 30 kOe from 350 K for samples (a) S1, (b) S2, (c) S3, (d) S4, (e) S5, and (f) S7.

Image of FIG. 9.
FIG. 9.

Cooling field dependence of HC and Ms after field cooling from 350 K for S3.

Image of FIG. 10.
FIG. 10.

Temperature dependence of HC (a), HEB (b), and MShift (c) for samples with different crystalline sizes.

Image of FIG. 11.
FIG. 11.

The relationship between HEB and MShift for samples (a) S2, (b) S3, (c) S4, and (d) S5.

Tables

Generic image for table
Table I.

Description of the synthesis conditions for the NiFe2O4/NiO nanogranular systems and crystalline sizes determined by XRD.

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/content/aip/journal/jap/113/14/10.1063/1.4800529
2013-04-12
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Size-dependent scaling of exchange bias in NiFe2O4/NiO nanogranular systems synthesized by a phase separation method
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/14/10.1063/1.4800529
10.1063/1.4800529
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