Patent ID: 8289222

Claim:
A portable device comprising: a wiring board; a spiral antennal element connected to a power feeding terminal provided for the wiring board; and a magnetic material provided on the inside of the antenna element, wherein the magnetic material is a core-shell magnetic material containing core-shell magnetic particles including: magnetic metal particles containing: at least one magnetic metal selected from the group of Fe, Co, and Ni, at least one nonmagnetic metal selected from the group of Mg, Al, Si, Ca, Zr, Ti, Hf, Zn, Mn, a rare-earth element, Ba, and Sr, at least one element selected from carbon and nitrogen, and an oxide coating layer coating surfaces of at least a part of the magnetic metal particles, the oxide coating layer being made of an oxide containing at least one nonmagnetic metal contained in the magnetic metal particles; and oxide particles existing in at least a part of space between the magnetic metal particles, the oxide particles containing at least one nonmagnetic metal selected from the group of Mg, Al, Si, Ca, Zr, Ti, Hf, Zn, Mn, a rare-earth element, Ba, and Sr, wherein a nonmagnetic metal/magnetic metal ratio in the oxide particles is higher than that in the oxide coating layer, the nonmagnetic metal/magnetic metal ratio being an atomic ratio; wherein the nonmagnetic metal/magnetic metal ratio is the atomic ratio.