US 2010/0060538 A1 · CORE-SHELL MAGNETIC MATERIAL, METHOD OF MANUFACTURING CORE-SHELL MAGNETIC MATERIAL, DEVICE, ANTENNA DEVICE, AND PORTABLE DEVICE

Abstract

The present invention provides a core-shell magnetic material having an excellent characteristic in a high frequency band, particularly, in a GHz band. The core-shell magnetic material includes: core-shell magnetic particles including magnetic metal particles and an oxide coating layer, the magnetic metal particle containing magnetic metal selected from the group of Fe, Co, and Ni, nonmagnetic metal selected from the group of Mg, Al, Si, Ca, Zr, Ti, Hf, Zn, Mn, a rare-earth element, Ba, and Sr, and an element selected from carbon and nitrogen, and the oxide coating layer being made of an oxide containing at least one nonmagnetic metal as one of the components of the magnetic metal particle; and oxide particles existing at least a part between the magnetic metal particles and containing nonmagnetic metal selected from the group of Mg, Al, Si, Ca, Zr, Ti, Hf, Zn, Mn, a rare-earth element, Ba, and Sr, and in which nonmagnetic metal/magnetic metal (atomic ratio) in the particles is higher than that in the oxide coating layer.

Claims25

Dependent claims

A core-shell magnetic material comprising:

core-shell magnetic particles including magnetic metal particles and an oxide coating layer for coating surface of at least apart of the magnetic metal particles, the magnetic metal particle 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, and at least one element selected from carbon and nitrogen, and the oxide coating layer being made of an oxide containing at least one nonmagnetic metal contained in the magnetic metal particle;
and
oxide particles existing at least in a part of space between the magnetic metal particles and 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, and in which nonmagnetic metal/magnetic metal (atomic ratio) in the particles is higher than that in the oxide coating layer.

A device comprising a core-shell magnetic material containing:

core-shell magnetic particles including magnetic metal particles and an oxide coating layer for coating surface of at least a part of the magnetic metal particles, the magnetic metal particle 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, and at least one element selected from carbon and nitrogen, and the oxide coating layer being made of an oxide containing at least one nonmagnetic metal as one of the components of the magnetic metal particle;
and
oxide particles existing at least in a part of space between the magnetic metal 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, and in which nonmagnetic metal/magnetic metal (atomic ratio) in the particles is higher than that in the oxide coating layer.

An antenna device comprising a core-shell magnetic material containing:

core-shell magnetic particles including magnetic metal particles and an oxide coating layer for coating surface of at least a part of the magnetic metal particles, the magnetic metal particle 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, and at least one element selected from carbon and nitrogen, and the oxide coating layer being made of an oxide containing at least one nonmagnetic metal contained in the magnetic metal particle;
and
oxide particles existing at least in a part of space between the magnetic metal 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, and in which nonmagnetic metal/magnetic metal (atomic ratio) in the particles is higher than that in the oxide coating layer.

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 and an oxide coating layer for coating surface of at least apart of the magnetic metal particles, the magnetic metal particle 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, and at least one element selected from carbon and nitrogen, and the oxide coating layer being made of an oxide containing at least one nonmagnetic metal contained in the magnetic metal particle;
and
oxide particles existing at least in a part of space between the magnetic metal 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, and in which nonmagnetic metal/magnetic metal (atomic ratio) in the particles is higher than that in the oxide coating layer.

5 more elements

Dependencies are inferred from the claim text.

Core-shell magnetic material, method of manufacturing core-shell magnetic material, device, antenna device, and portable device

Life of this patent

Core-shell magnetic material, method of manufacturing core-shell magnetic material, device, antenna device, and portable device

Life of this patent

Abstract

Claims25