1
John J Croat: High energy product rare earth-iron magnet alloys. General Motors Corporation, Elizabeth F Harasek, February 7, 1989: US04802931 (72 worldwide citation)

Magnetically hard compositions having high values of coercivity, remanence and energy product contain rare earth elements, transition metal elements and boron in suitable proportions. The preferred rare earth elements are neodymium and praseodymium, and the preferred transition metal element is iron ...


2
John J Croat: High coercivity rare earth-iron magnets. General Motors Corporation, E F Harasek, January 29, 1985: US04496395 (50 worldwide citation)

Ferromagnetic compositions having intrinsic magnetic coercivities at room temperature of at least 1,000 Oersteds are formed by the controlled quench of molten rare earth-transition metal alloys. Hard magnets may be inexpensively formed from the lower atomic weight lanthanide elements and iron.


3
John J Croat: High energy product rare earth-iron magnet alloys. General Motors Corporation, Elizabeth F Harasek, July 25, 1989: US04851058 (35 worldwide citation)

The hard magnetic properties, including intrinsic coercivity, remanence and energy product of rapidly quenched, rare earth-transition metal alloys has been substantially increased by the addition of suitable amounts of the element boron. The preferred rare earth constituent elements are neodymium an ...


4
Robert W Lee, John J Croat: Bonded rare earth-iron magnets. General Motors Corporation, Elizabeth F Harasek, February 20, 1990: US04902361 (29 worldwide citation)

This invention relates to permanent bonded magnets of very finely crystalline, melt-spun, rare earth-iron alloys. The compacts are magnetically isotropic.


5
John J Croat: High energy product rare earth-iron magnet alloys. General Motors Corporation, George A Grove, December 22, 1992: US05172751 (24 worldwide citation)

Magnetically hard compositions having high values of coercivity, remanence and energy product contain rare earth elements, transition metal elements and boron in suitable proportions. The preferred rare earth elements are neodymium and praseodymium, and the preferred transition metal element is iron ...


6
Andrew R Chraplyvy, Jan F Herbst, John J Croat: Selective magnetization of rare-earth transition metal alloys. General Motors Corporation, Elizabeth F Harasek, August 31, 1982: US04347086 (18 worldwide citation)

An amorphous rare-earth transition metal body is provided that has integral, predetermined regions of hard and soft magnetism. A method is provided for heating portions of an amorphous rare-earth transition metal alloy body, in situ, to transform predetermined portions from a state of low magnetic c ...


7
Robert W Lee, John J Croat: Method of making a laminated rare earth metal-cobalt permanent magnet body. General Motors Corporation, George A Grove, February 28, 1978: US04076561 (16 worldwide citation)

In a preferred embodiment thin layers of rare earth metal-cobalt powder comprising an outer layer of RCo.sub.5 and a discrete transitional layer of R.sub.2 Co.sub.17 are compressed against an adjacent thicker layer of iron powder to form a laminated green compact, with the rare earth-cobalt powdered ...


8
Andrew R Chraplyvy, John J Croat, Jan F Herbst: Selective magnetization of manganese-aluminum alloys. General Motors Corporation, E F Harasek, January 26, 1982: US04312684 (15 worldwide citation)

A portion of a nonmagnetic body of manganese-aluminum based alloy is tempered in situ to a state of high magnetic coercivity. The magnetically coercive portion may be used, e.g., to store magnetically readable information or to provide a tailored permanent magnetic field for an electrical device.


9
Viswanathan Panchanathan, John J Croat: Hot pressed magnets formed from anisotropic powders. General Motors Corporation, George A Grove, October 4, 1994: US05352301 (15 worldwide citation)

A method is provided for forming a high energy product, anisotropic, hot pressed iron-rare earth metal permanent magnet without the requirement for magnetic alignment during pressing or additional hot working steps. The method of this invention includes providing a quantity of anisotropic iron-rare ...


10
Earl G Brewer, Robert W Lee, John J Croat: Method for producing anisotropic RE-FE-B type magnetically aligned material. General Motors Corporation, George A Grove, November 21, 1989: US04881985 (8 worldwide citation)

A method to produce rare earth (RE), iron, boron type anisotropic permanently magnetic material includes forming magnetically isotropic coarse powder particles of melt-spun alloy with a very fine grain RE.sub.2 FE.sub.14 B phase. The particles are mixed with inert particles of a size and of a weight ...