On magnetic properties of superparamagnets in the Curie point regionстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 26 января 2018 г.
Аннотация:The features of the paraprocess in superparamagnetic particles in the Curie point region are discussed. To describe the
dependencies of the magnetic properties of superparamagnetic particles on temperature and "eld, the molecular "eld
theory supplemented with the Langevin model is applied. It is shown that, as in the case of ordinary ferromagnetic
particles, the paraprocess in superparamagnetic particles in the region of small "elds is determined by the dominant
in#uence of the exchange "eld inside the particle. The role of the external "eld is, mainly, to change (or even to give rise to)
the exchange "eld. However, the quantitative characteristics describing the paraprocess in a superparamagnet are
completely di!erent. The magnetic susceptibility of the paraprocess sM (Mbeing the speci"c magnetization of the particle
corresponding to its &relaxation' magnetic moment l in the "eld H) at the Curie temperature is independent of the "eld
strength. Under the same conditions, the &experimentally measured' magnetization p is changed with the "eld in
accordance with the H3 law.