Samarium-cobalt magnets are much more powerful than iron magnets (Samarium-Rare Earth Magnet (1974)); they remain magnetic at high temperatures and so are used in microwave applications (Microwave Tubes Incorporating Rare Earth Magnets (1980)), and they enabled the miniaturisation of electronic devices like headphones (Headphone (1999)).
Samarium is used to dope calcium fluoride crystals for use in optical lasers: Lasers (1966).
It is also used as a neutron absorber in nuclear reactors: Neutron Shielding Material (1958).
Samarium oxide finds specialised use in glass and ceramics: Glass Ceramic Mass And Use Thereof (2004).
In common with other lanthanides, Samarium is used in carbon arc lighting for studio lighting and projection: Improvements in electric arc-producing apparatus (1967).
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All patent information has been obtained from Espacenet (European Patent Office).