US 11,862,369 B2
Permanent magnets with tailored texture and magnetic orientation
Brennan Yahata, Santa Barbara, CA (US); Eric Clough, Santa Monica, CA (US); Christopher Henry, Thousand Oaks, CA (US); Amber Sucich, Calabasas, CA (US); Darby Laplant, Santa Monica, CA (US); and Tobias Schaedler, Oak Park, CA (US)
Assigned to HRL Laboratories, LLC, Malibu, CA (US)
Filed by HRL Laboratories, LLC, Malibu, CA (US)
Filed on Jun. 26, 2021, as Appl. No. 17/359,556.
Claims priority of provisional application 63/061,798, filed on Aug. 6, 2020.
Claims priority of provisional application 63/061,800, filed on Aug. 6, 2020.
Prior Publication US 2022/0044851 A1, Feb. 10, 2022
Int. Cl. H01F 1/055 (2006.01); C22C 38/00 (2006.01); C22C 38/30 (2006.01); C22C 38/08 (2006.01); C22C 38/10 (2006.01); C22C 38/06 (2006.01); B33Y 80/00 (2015.01); H01F 7/02 (2006.01); H01F 1/057 (2006.01); H01F 13/00 (2006.01); H01F 41/02 (2006.01)
CPC H01F 1/055 (2013.01) [B33Y 80/00 (2014.12); C22C 38/005 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/105 (2013.01); C22C 38/30 (2013.01); H01F 1/0577 (2013.01); H01F 7/021 (2013.01); H01F 7/0278 (2013.01); H01F 13/003 (2013.01); H01F 41/0266 (2013.01); H01F 41/0273 (2013.01); C22C 2202/02 (2013.01)] 29 Claims
OG exemplary drawing
 
1. A permanent-magnet structure comprising:
a region having a plurality of magnetic domains and a region-average magnetic axis, wherein each of said magnetic domains has a domain magnetic axis, wherein each said domain magnetic axis is substantially aligned with said region-average magnetic axis, and wherein said plurality of magnetic domains is characterized by an average magnetic domain size from 1 micron to 1000 microns; and
within said region, a plurality of metal-containing grains, wherein said plurality of metal-containing grains is characterized by an average grain size from 0.1 microns to 50 microns,
wherein said metal-containing grains contain a metal alloy selected from the group consisting of NdFeB, NdDyFeB, FeCoCr, FeAlNiCo, SmCo, Dy2O3, SrRuO3, Fe2O3, FeSi, FeNi, FeZn, MnZn, and combinations thereof,
wherein each of said magnetic domains has a domain easy axis that is dictated by a crystallographic texture of said metal-containing grains;
wherein said region has a region-average easy axis based on average value of said domain easy axis within said region; and
wherein said region-average magnetic axis and said region-average easy axis form a region-average alignment angle θ, wherein said region-average alignment angle θ is from −10° to 10°, and wherein said region-average alignment angle θ has a 0 standard deviation of less than 10° based on alignment-angle variance within said plurality of magnetic domains.