A magnetic recording and reproducing apparatus comprises a magnetic head having magnetic cores in which at least portions thereof in the vicinity of a gap are made of M.sub.n -Z.sub.n ferrite single crystal and planes of the magnetic cores forming a principal magnetic circuit are formed by {110} planes...http://www.google.com.au/patents/US4571652?utm_source=gb-gplus-sharePatent US4571652 - Magnetic recording and reproducing apparatus
