Monocrystals of heavy rare-earth metals, containing (0,3-0,5 at%) admixture of *991*991*999Sn messbauer isotope are considered in the paper aiming at the experimental and theoretical investigation of the magnetic disturbance, induced by a non-magnet atom-sonde into a rare-earth matrix. As a result the new class of magnetic formations in rare-earth metals (REM) - admixture magnetic centres (AMC)-has been detected. Their specific properties have been investigated in details. Some problems of the REM magnetism physics have been solved on the base of representations about AMC. AMC may be located in various rare-earth alloys, used for the technical magnetization, magnetic record and in constant magnets. AMC may have been the big influence on magnetic properties of these objects. Ways for the account of this influence have been developedAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio
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