Coercivity of nanoporous Ni produced by dealloying

Hakamada, Masataka; Takahashi, Masaki; Furukawa, Toshiyuki; Mabuchi, Mamoru
April 2009
Applied Physics Letters;4/13/2009, Vol. 94 Issue 15, p153105
Academic Journal
Nanoporous Ni specimens with the ligament lengths of 10–210 nm were produced by the dealloying of Ni0.25Mn0.75 alloy and annealing at 473–873 K. The coercivity (Hc) increased with increasing ligament length (L) up to 50 nm, and decreased with increasing L above 50 nm. At L<50 nm, the size dependence of Hc for nanoporous Ni is lower than that for nanocrystalline Ni. The low size dependence of Hc is discussed on basis of a random anisotropy model.


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