Surface effects on saturation magnetization in nanoporous Ni |
| |
Authors: | Masataka Hakamada Masaki Takahashi Toshiyuki Furukawa Mamoru Mabuchi |
| |
Institution: | 1. Materials Research Institute for Sustainable Development , National Institute of Advanced Industrial Science and Technology , 2266-98 Anagahora, Shimo-shidami, Moriyama, Nagoya 463-8560, Japan masataka-hakamada@aist.go.jp;3. Department of Energy Science and Technology , Graduate School of Energy Science, Kyoto University, Yoshidahonmachi , Sakyo, Kyoto 606-8501, Japan |
| |
Abstract: | Nanoporous Ni specimens with ligament lengths of 10–210 nm and specific surface areas of 0.03–0.58 nm?1 were fabricated by the dealloying of Ni0.25Mn0.75 alloy and annealing at 473–873 K, and saturation magnetization investigated in terms of their size dependence. Saturation magnetization decreased with decreasing ligament length or increasing specific surface area. This trend is the same as that for nanoparticle Ni. However, the saturation magnetization of nanoporous Ni tends to be lower than that of the nanoparticle Ni when their specific surface areas are the same. It is suggested, therefore, that the surface effect due to a noncollinear arrangement is enhanced by the surface defects in the nanoporous Ni. |
| |
Keywords: | nanoporous nickel magnetic materials |
|
|