Title:
MAGNETIC POWDER OF MAGNETOPLUMBITE-TYPE HEXAGONAL FERRITE AND METHOD FOR PRODUCING SAME, AND RADIO WAVE ABSORBER AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2022/186060
Kind Code:
A1
Abstract:
The present invention provides: a magnetic powder of a magnetoplumbite-type hexagonal ferrite, the magnetic powder having an ability to absorb radio waves in the band of 60 to 90 GHz including the 76 GHz band, while having a small change in the peak frequency over a wide temperature range; a method for producing this magnetic powder of a magnetoplumbite-type hexagonal ferrite; a radio wave absorber which uses this magnetic powder; and a method for producing this radio wave absorber. A magnetic powder of a magnetoplumbite-type hexagonal ferrite, the magnetic powder satisfying the general formula A(1-x)LaxFe(n-y-z)AlyCoz (wherein A represents one or more elements selected from the group consisting of Sr, Ba and Ca; 0.01 ≤ x ≤ 0.70; 1.00 ≤ y ≤ 2.20; 11.00 ≤ n ≤ 12.50; and 0.00 ≤ z ≤ 1.00), which shows the atomic ratio among the metal elements.
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Inventors:
YAMAJI HIDENORI (JP)
SUZUKI HIROMI (JP)
SUZUKI HIROMI (JP)
Application Number:
PCT/JP2022/007750
Publication Date:
September 09, 2022
Filing Date:
February 24, 2022
Export Citation:
Assignee:
DOWA ELECTRONICS MATERIALS CO (JP)
International Classes:
C01G49/00; H01F1/11; H01F1/113; H01F41/02; H05K9/00
Domestic Patent References:
| WO2014021426A1 | 2014-02-06 |
Foreign References:
| JP2005032745A | 2005-02-03 | |||
| JP2000277312A | 2000-10-06 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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