Limits...
Strong textured SmCo5 nanoflakes with ultrahigh coercivity prepared by multistep (three steps) surfactant-assisted ball milling.

Zuo WL, Zhao X, Xiong JF, Zhang M, Zhao TY, Hu FX, Sun JR, Shen BG - Sci Rep (2015)

Bottom Line: The high coercivity of 26.2 kOe for SmCo5 nanoflakes are obtained by multistep (three steps) surfactant-assisted ball milling.The magnetic properties, phase structure and morphology are studied by VSM, XRD and SEM, respectively.The results demonstrate that the three step ball-milling can keep more complete crystallinity (relatively less defects) during the process of milling compared with one step high energy ball-milling, which enhances the texture degree and coercivity.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.

ABSTRACT
The high coercivity of 26.2 kOe for SmCo5 nanoflakes are obtained by multistep (three steps) surfactant-assisted ball milling. The magnetic properties, phase structure and morphology are studied by VSM, XRD and SEM, respectively. The results demonstrate that the three step ball-milling can keep more complete crystallinity (relatively less defects) during the process of milling compared with one step high energy ball-milling, which enhances the texture degree and coercivity. In addition, the mechanism of coercivity are also studied by the temperature dependence of demagnetization curves for aligned SmCo5 nanoflakes/resin composite, the result indicates that the magnetization reversal could be controlled by co-existed mechanisms of pinning and nucleation.

No MeSH data available.


Related in: MedlinePlus

(a) The hysteresis loop, (b) temperature dependence of demagnetization curves and (c)  against on different temperature for aligned SmCo5 nanoflakes/resin composites with by 24 h BM.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4536656&req=5

f4: (a) The hysteresis loop, (b) temperature dependence of demagnetization curves and (c) against on different temperature for aligned SmCo5 nanoflakes/resin composites with by 24 h BM.

Mentions: Figure 4(a) shows the hysteresis loops of aligned SmCo5 nanoflakes prepared by 24 h three steps SABM. The obvious anisotropy magnetic behaviors are observed. However, the Hc (24.4 kOe) for the aligned sample shows an obviously decrease compared with that of unaligned one (26.2 kOe) (see Fig. 1(a)), which phenomenon is also observed for many rare earth permanent magnetic materials161718. In addition, the Mr/Ms reaches 0.94 for parallel direction of the easy axis, which indicates that the sample have a good alignment degree. In order to more accurately describe the alignment degree, we also calculate the average misalignment angle, 719, where Mr(┴) and Mr(//) are the remanence of perpendicular and parallel direction of the easy axis, respectively. The misalignment angle φ = 19°, which is smaller than the experiment results of BM in the magnetic field720, indicates that the nanoflakes with three steps SABM have a higher texture degree.


Strong textured SmCo5 nanoflakes with ultrahigh coercivity prepared by multistep (three steps) surfactant-assisted ball milling.

Zuo WL, Zhao X, Xiong JF, Zhang M, Zhao TY, Hu FX, Sun JR, Shen BG - Sci Rep (2015)

(a) The hysteresis loop, (b) temperature dependence of demagnetization curves and (c)  against on different temperature for aligned SmCo5 nanoflakes/resin composites with by 24 h BM.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4536656&req=5

f4: (a) The hysteresis loop, (b) temperature dependence of demagnetization curves and (c) against on different temperature for aligned SmCo5 nanoflakes/resin composites with by 24 h BM.
Mentions: Figure 4(a) shows the hysteresis loops of aligned SmCo5 nanoflakes prepared by 24 h three steps SABM. The obvious anisotropy magnetic behaviors are observed. However, the Hc (24.4 kOe) for the aligned sample shows an obviously decrease compared with that of unaligned one (26.2 kOe) (see Fig. 1(a)), which phenomenon is also observed for many rare earth permanent magnetic materials161718. In addition, the Mr/Ms reaches 0.94 for parallel direction of the easy axis, which indicates that the sample have a good alignment degree. In order to more accurately describe the alignment degree, we also calculate the average misalignment angle, 719, where Mr(┴) and Mr(//) are the remanence of perpendicular and parallel direction of the easy axis, respectively. The misalignment angle φ = 19°, which is smaller than the experiment results of BM in the magnetic field720, indicates that the nanoflakes with three steps SABM have a higher texture degree.

Bottom Line: The high coercivity of 26.2 kOe for SmCo5 nanoflakes are obtained by multistep (three steps) surfactant-assisted ball milling.The magnetic properties, phase structure and morphology are studied by VSM, XRD and SEM, respectively.The results demonstrate that the three step ball-milling can keep more complete crystallinity (relatively less defects) during the process of milling compared with one step high energy ball-milling, which enhances the texture degree and coercivity.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.

ABSTRACT
The high coercivity of 26.2 kOe for SmCo5 nanoflakes are obtained by multistep (three steps) surfactant-assisted ball milling. The magnetic properties, phase structure and morphology are studied by VSM, XRD and SEM, respectively. The results demonstrate that the three step ball-milling can keep more complete crystallinity (relatively less defects) during the process of milling compared with one step high energy ball-milling, which enhances the texture degree and coercivity. In addition, the mechanism of coercivity are also studied by the temperature dependence of demagnetization curves for aligned SmCo5 nanoflakes/resin composite, the result indicates that the magnetization reversal could be controlled by co-existed mechanisms of pinning and nucleation.

No MeSH data available.


Related in: MedlinePlus