Magnetically anisotropic binder-free films containing discrete hexaferrite nanoplatelets

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United States of America

PATENT NO 11295882
SERIAL NO

16592477

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Abstract

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Some variations provide a magnetically anisotropic structure comprising a hexaferrite film disposed on a substrate, wherein the hexaferrite film contains a plurality of discrete and aligned magnetic hexaferrite particles, wherein the hexaferrite film is characterized by an average film thickness from about 1 micron to about 500 microns, and wherein the hexaferrite film contains less than 2 wt % organic matter. The hexaferrite film does not require a binder. Discrete particles are not sintered or annealed together because the maximum processing temperature to fabricate the structure is 500° C. or less, such as 250° C. or less. The magnetic hexaferrite particles may contain barium hexaferrite (BaFe12O19) and/or strontium hexaferrite (SrFe12O19). The hexaferrite film may be characterized by a remanence-to-saturation magnetization ratio of at least 0.7. Methods of making and using the magnetically anisotropic structure are also described.

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Patent Owner(s)

  • HRL LABORATORIES, LLC

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cui, Shanying Calabasas, US 30 42
Gross, Adam F Santa Monica, US 146 718
Guan, Xin N Monterey Park, US 10 3
Herrault, Florian G Agoura Hills, US 31 148

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