<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" article-type="research-article" dtd-version="1.2" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">Journal of Experimental and Theoretical Physics</journal-id><journal-title-group><journal-title>Journal of Experimental and Theoretical Physics</journal-title></journal-title-group><issn publication-format="print">0044-4510</issn><issn publication-format="electronic">3034-641X</issn><publisher><publisher-name>Russian Academy of Science</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.31857/S0044451023120167</article-id><title-group><article-title>Magnetic Interparticle Interactions and Superparamagnetic Blocking of Powder Systems of Biogenic Ferrihydrite Nanoparticles</article-title><trans-title-group xml:lang="ru"><trans-title>Магнитные межчастичные взаимодействия и суперпарамагнитная блокировка порошковых систем наночастиц биогенного ферригидрита</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid"></contrib-id><name-alternatives><name xml:lang="en"><surname>Krasikov</surname><given-names>A. A.</given-names></name><name xml:lang="ru"><surname>Красиков</surname><given-names>А. А. </given-names></name></name-alternatives><email>krasikov_a_a_noemail@ras.ru</email><xref ref-type="aff" rid="aff-1"></xref><xref ref-type="aff" rid="aff-2"></xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid"></contrib-id><name-alternatives><name xml:lang="en"><surname>Knyazev</surname><given-names>Yu. V.</given-names></name><name xml:lang="ru"><surname>Князев</surname><given-names>Ю. В. </given-names></name></name-alternatives><email>knyazev_yu_v_noemail@ras.ru</email><xref ref-type="aff" rid="aff-3"></xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid"></contrib-id><name-alternatives><name xml:lang="en"><surname>Balaev</surname><given-names>D. A</given-names></name><name xml:lang="ru"><surname>Балаев</surname><given-names>Д. А </given-names></name></name-alternatives><email>balaev_d_a_noemail@ras.ru</email><xref ref-type="aff" rid="aff-5"></xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid"></contrib-id><name-alternatives><name xml:lang="en"><surname>Stolyar</surname><given-names>S. V.</given-names></name><name xml:lang="ru"><surname>Столяр</surname><given-names>С. В. </given-names></name></name-alternatives><email>stolyar_s_v_noemail@ras.ru</email><xref ref-type="aff" rid="aff-7"></xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid"></contrib-id><name-alternatives><name xml:lang="en"><surname>Ladygina</surname><given-names>V. P.</given-names></name><name xml:lang="ru"><surname>Ладыгина</surname><given-names>В. П. </given-names></name></name-alternatives><email>ladygina_v_p_noemail@ras.ru</email><xref ref-type="aff" rid="aff-9"></xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid"></contrib-id><name-alternatives><name xml:lang="en"><surname>Balaev</surname><given-names>A. D.</given-names></name><name xml:lang="ru"><surname>Балаев</surname><given-names>А. Д. </given-names></name></name-alternatives><email>balaev_a_d_noemail@ras.ru</email><xref ref-type="aff" rid="aff-11"></xref></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid"></contrib-id><name-alternatives><name xml:lang="en"><surname>Iskhakov</surname><given-names>R. S.</given-names></name><name xml:lang="ru"><surname>Исхаков</surname><given-names>Р. С. </given-names></name></name-alternatives><email>iskhakov_r_s_noemail@ras.ru</email><xref ref-type="aff" rid="aff-13"></xref></contrib></contrib-group><aff-alternatives id="aff-1"><aff><institution xml:lang="ru">Институт физики им. Л. В. Киренского ФИЦ КНЦ Сибирского отделения Российской академии наук</institution><institution xml:lang="en">Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff><institution xml:lang="ru"></institution><institution xml:lang="en"></institution></aff></aff-alternatives><aff-alternatives id="aff-3"><aff><institution xml:lang="ru">Институт физики им. Л. В. Киренского ФИЦ КНЦ Сибирского отделения Российской академии наук</institution><institution xml:lang="en">Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences</institution></aff></aff-alternatives><aff-alternatives id="aff-5"><aff><institution xml:lang="ru">Институт физики им. Л. В. Киренского ФИЦ КНЦ Сибирского отделения Российской академии наук</institution><institution xml:lang="en">Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences</institution></aff></aff-alternatives><aff-alternatives id="aff-7"><aff><institution xml:lang="ru">Институт физики им. Л. В. Киренского ФИЦ КНЦ Сибирского отделения Российской академии наук;ФИЦ КНЦ Сибирского отделения Российской академии наук</institution><institution xml:lang="en">Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences; Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”</institution></aff></aff-alternatives><aff-alternatives id="aff-9"><aff><institution xml:lang="ru">ФИЦ КНЦ Сибирского отделения Российской академии наук</institution><institution xml:lang="en">Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”</institution></aff></aff-alternatives><aff-alternatives id="aff-11"><aff><institution xml:lang="ru">Институт физики им. Л. В. Киренского ФИЦ КНЦ Сибирского отделения Российской академии наук</institution><institution xml:lang="en">Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences</institution></aff></aff-alternatives><aff-alternatives id="aff-13"><aff><institution xml:lang="ru">Институт физики им. Л. В. Киренского ФИЦ КНЦ Сибирского отделения Российской академии наук</institution><institution xml:lang="en">Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-12-01" publication-format="electronic"><day>01</day><month>12</month><year>2023</year></pub-date><volume>164</volume><issue>6</issue><fpage>1026</fpage><lpage>1038</lpage><abstract xml:lang="en"><p>The magnetic-field dependence of the superparamagnetic-blocking temperature TB of systems of antiferromagnetically ordered ferrihydrite nanoparticles has been investigated and analyzed. We studied two powder systems of nanoparticles: particles of “biogenic” ferrihydrite (with an average size of 2.7 nm), released as a result of vital functions of bacteria and coated with a thin organic shell, and particles of biogenic ferrihydrite subjected to low-temperature annealing, which cause an increase in the average particle size (to 3.8 nm) and burning out of the organic shell. The character of the temperature dependences of magnetization, measured after cooling in a weak field, as well as the shape of the obtained dependences TB(H), demonstrate peculiar features, indicating the influence of magnetic interparticle interactions. A detailed analysis of the dependences TB(H) within the random magnetic anisotropy model made it possible to estimate quantitatively the intensity of magnetic particle–particle interactions and determine the magnetic anisotropy constants of individual ferrihydrite particles.</p></abstract><trans-abstract xml:lang="ru"><p>Изучена и проанализирована магнитополевая зависимость температуры суперпарамагнитной блокировки TB систем антиферромагнитно упорядоченных наночастиц ферригидрита. Исследованы две порошковые системы наночастиц - «биогенный» ферригидрит, выделенный в результате жизнедеятельности бактерий, на поверхности частиц (средний размер 2.7 нм) которого присутствует тонкая органическая оболочка, а также биогенный ферригидрит, прошедший низкотемпературный отжиг, в результате которого увеличился средний размер частиц (3.8 нм) и «выгорела» органическая оболочка. Характер температурных зависимостей намагниченности, измеренных после охлаждения в малом поле, а также вид полученных зависимостей TB(H) демонстрируют специфические черты, указывающие на влияние магнитных межчастичных взаимодействий. Детальный анализ зависимостей TB(H) в рамках модели случайной магнитной анизотропии позволил получить количественные оценки интенсивности магнитных межчастичных взаимодействий и определить константы магнитной анизотропии индивидуальных частиц ферригидрита.</p></trans-abstract></article-meta></front><body></body><back><ref-list><ref id="B1"><label>B1</label><citation-alternatives><mixed-citation xml:lang="ru">S. Mørup, M. F. Hansen, and C. Frandsen, Beilstein J. Nanotechnol. 1, 182 (2010).</mixed-citation><mixed-citation xml:lang="en"></mixed-citation></citation-alternatives></ref><ref id="B2"><label>B2</label><citation-alternatives><mixed-citation xml:lang="ru">D. Caruntu, G. Caruntu, and Ch. J. O&amp;apos;Connor, J. Phys. D: Appl. 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