WIKI
Alnico magnets are widely used in industrial and consumer applications where strong permanent magnets are needed. Examples are electric motors, electric guitar pickups, microphones, sensors, loudspeakers, magnetron tubes, and cow magnets. In many applications they are being superseded by rare-earth magnets, whose stronger fields (Br) and larger energy products (B·Hmax) allow smaller-size magnets to be used for a given application.
Al+Ni+Co+Cu and often Ti
https://en.wikipedia.org/wiki/Alnico
ALNICO magnets are still used, but neodymium magnets are much stronger.
Sometimes called rare-earth magnets.
https://en.wikipedia.org/wiki/Neodymium_magnet
Fun things, I placed a fair-sized neodymium N52 on my CEO’s refrigerator, took him some time, help, and two pairs of vice grips to remove it without scratching or denting.
Crazy strong and I have seen a few accidents needing stitches from them.