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As the temperature becomes lower than the blocking temperature, the angular dependence changes to that typical of the magnetization reversal through a coherent rotation of granules\u2019 magnetic moments. It is shown theoretically that the anomaly is determined by a singularity of the angular dependence of the critical field causing the absolute loss of the superferromagnetic phase stability in the ensemble of weakly interacting ferromagnetic nanoparticles.<\/jats:p>","DOI":"10.1063\/1.3480802","type":"journal-article","created":{"date-parts":[[2010,9,1]],"date-time":"2010-09-01T23:18:24Z","timestamp":1283383104000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":19,"title":["Coercivity anomaly in the superferromagnetic state of an ensemble of nanoparticles with oriented anisotropy"],"prefix":"10.1063","volume":"108","author":[{"given":"A. 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