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͑ a ͒ Influence of milling time t m on particle size d and ͑ b ͒ linear dependence of coercivity H c with v Ϫ 1/2 for as-milled ͑ ᭹ ͒
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Figure 5 a shows the size dependence on t m . It is worth to note that as Fig. 5 ͑ b ͒ indicates H c shows a linear dependence with v Ϫ 1/2 or d Ϫ 3/2 for samples with larger or smaller particle size. This surprisingly excellent fitting to Eq. ͑ 2 ͒ suggests that for low , the increase of H c may be mainly due to the increase of ͗ k ͘ as a consequence of the size reduction, as described by Eq. ͑ 2 ͒ . In summary, we have shown that soft magnetic materials based on random anisotropy systems undergo a remarkable hardening with decreasing particle size by milling. It can be concluded that for high the increase of H c is due to the magnetoelastic anisotropy generated by . Even though other effects can also be involved, the experimental results seem to indicate that the influence of the particle size on the average structural anisotropy noticeably contributes to the hardening observed for low . The authors wish to acknowledge NATO support, which under Science for Peace 971930 ‘‘Magnetic Nanocompos- ites’’ project has allowed a fruitful collaboration between ...
Context 2
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Figure 5 a shows the size dependence on t m . It is worth to note that as Fig. 5 ͑ b ͒ indicates H c shows a linear dependence with v Ϫ 1/2 or d Ϫ 3/2 for samples with larger or smaller particle size. This surprisingly excellent fitting to Eq. ͑ 2 ͒ suggests that for low , the increase of H c may be mainly due to the increase of ͗ k ͘ as a consequence of the size reduction, as described by Eq. ͑ 2 ͒ . In summary, we have shown that soft magnetic materials based on random anisotropy systems undergo a remarkable hardening with decreasing particle size by milling. It can be concluded that for high the increase of H c is due to the magnetoelastic anisotropy generated by . Even though other effects can also be involved, the experimental results seem to indicate that the influence of the particle size on the average structural anisotropy noticeably contributes to the hardening observed for low . The authors wish to acknowledge NATO support, which under Science for Peace 971930 ‘‘Magnetic Nanocompos- ites’’ project has allowed a fruitful collaboration between ...
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