Wikipedia lists, under uses for thulium, that it has potential use for ferrite ceramic magnets. I want to know why, I looked everywhere and I see nothing further on the topic. The link provided by Wikipedia was just to a link to a preview of an ebook called "Extractive Metallurgy of Rare Earths" which just made the same claim without further substantiation. I want to know, what it is about thulium that would make it attractive to consider in the production of ferrite magnets. Unlike most of the other lanthanides, thulium is capable of forming a +2 as well as a +3 oxidation state, which I figure would make it incorporable into the Me2+ sites in the crystal, as a substitution for say barium or strontium. But what would this do to the magnet? Make it stronger? More heat resistant? Being a lanthanide, it has f-orbitals that can cause it to have funky magnetic properties, is there a computational way to determine these? Would there be any advantages over samarium cobalt or neodymium iron boron magnets that would potentially offset the cost, which I figure is the main reason why there are none of these on the market? Are any of these even currently in research and development? Sorry, I'm just kind of obsessed with the lanthanides, I want to know all about them, their uses, their properties, particularly their magnetic properties, I consider them the rock stars of the periodic table. I'm studying all the mathematics that I can on my own so that I can understand the tensor equations used to calculate nonlinear optical properties and the quantum mechanics behind bond and lattice energies and wavelengths absorbed and transmitted and I want to know all of it so I can figure out how to calculate the ideal composition and structure and transition temperature of say a superconductor without having to first run through costly trials and errors. Is that an active field of theoretical research?