Flat magnetic element and power ic package using the same
AssigneesKabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
InventorsTetsuo Inoue, Akira Sato, Katsutoshi Nakagawa
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Abstract
A planar magnetic device 1 including a first magnetic layer 3, a second magnetic layer 5, and a planar coil 4 disposed between the first magnetic layer 3 and the second magnetic layer 5, wherein magnetic particles 7 having a shape ratio S/L of 0.7 to 1 when a length of a long axis is L and a length of a short axis orthogonal to the long axis is L are filled in a gap W between coil wirings of the planar coil 4. According to the planar magnetic device 1, it is possible to realize a planar magnetic device such as an inductor reduced in height by using fine particles that enable to effectively obtain a large inductance value.
Claims11
A planar magnetic device comprising a first magnetic layer, a second magnetic layer, and a planar coil disposed between the first magnetic layer and the second magnetic layer, wherein magnetic particles having a shape ratio S/L of 0.7 to 1 when a length of a long axis is L and a length of a short axis orthogonal to the long axis is L are filled in a gap between coil wirings of the planar coil.
Dependencies are inferred from the claim text.