Academia.eduAcademia.edu

Figure from:Magneto electric effects in BaTiO3–CoFe2O4 bulk composites

See full PDFdownloadDownload figure
Figure 2

Figure 2

Related Figures (5)

Fig. 2. (Color online) M-H Curves of BT;_,-CFO, composites. (Inset shows variation in the saturation magnetization (M,) with CFO content.). Fig. 1. (Color online) X ray diffraction of BT, CFO and the BT; _,-CFO, composites.
Fig. 2. (Color online) M-H Curves of BT;_,-CFO, composites. (Inset shows variation in the saturation magnetization (M,) with CFO content.). Fig. 1. (Color online) X ray diffraction of BT, CFO and the BT; _,-CFO, composites.
Comparison of peak MEVCs ( + #33, + %31), remnant MEVCs ( + %33, +031), ratio of peak MEVC and densities of BT; _,-CFO, composites. The observed hysteresis and remanence characteristics of MEVC shown in Fig. 3(a and b) are explained on the basis of magnetostriction characteristics explicitly relating to those of BT- CFO composite. A representative curve projecting the fine changes in 2 vs. Hpc magnetostriction characteristics of BTg¢-CFOo.4 composite as observed by Hrib and Caltun [12] are reproduced in Fig. 4(b and d), which are quite different from those of the pure CFO [7,12]. The magnetostriction data on composite reveals many interesting features in the low field region (+500 Oe) such as (i) changes in the sign of magnetostriction, (ii) the occurrence of two distinct peaks in the 4 vs.Hpc hysteresis curves, and (iii) a large differential change (d/A/dH) indicating an increased sensitivity in stress due to magnetization [19].
Comparison of peak MEVCs ( + #33, + %31), remnant MEVCs ( + %33, +031), ratio of peak MEVC and densities of BT; _,-CFO, composites. The observed hysteresis and remanence characteristics of MEVC shown in Fig. 3(a and b) are explained on the basis of magnetostriction characteristics explicitly relating to those of BT- CFO composite. A representative curve projecting the fine changes in 2 vs. Hpc magnetostriction characteristics of BTg¢-CFOo.4 composite as observed by Hrib and Caltun [12] are reproduced in Fig. 4(b and d), which are quite different from those of the pure CFO [7,12]. The magnetostriction data on composite reveals many interesting features in the low field region (+500 Oe) such as (i) changes in the sign of magnetostriction, (ii) the occurrence of two distinct peaks in the 4 vs.Hpc hysteresis curves, and (iii) a large differential change (d/A/dH) indicating an increased sensitivity in stress due to magnetization [19].
Fig. 3. (Color online) ME hysteresis and remanence characteristics of BT; _,-CFO, composites (x=0.2 to 0.5) in the (a) transverse and (b) longitudinal configuration.
Fig. 3. (Color online) ME hysteresis and remanence characteristics of BT; _,-CFO, composites (x=0.2 to 0.5) in the (a) transverse and (b) longitudinal configuration.
* At Hpc=0. Correlation between (Apar vs. Hpc) and (#33 vs. Hpc)- Table 2
* At Hpc=0. Correlation between (Apar vs. Hpc) and (#33 vs. Hpc)- Table 2
Fig. 4. (Color online) Correlation of hysteresis in MEVC with magnetostriction characteristics of BTo4-CFOo¢ bulk composites. (a) %31 vs. Hpc (D) Aper vs. Hpx magnetostriction characteristics [12] (c) «33 vs. Hpc (d) Aper vs. Hoc Magnetostriction characteristics [12].
Fig. 4. (Color online) Correlation of hysteresis in MEVC with magnetostriction characteristics of BTo4-CFOo¢ bulk composites. (a) %31 vs. Hpc (D) Aper vs. Hpx magnetostriction characteristics [12] (c) «33 vs. Hpc (d) Aper vs. Hoc Magnetostriction characteristics [12].