Magnetic properties and the mechanism of formation of the uncompensated magnetic moment of antiferromagnetic ferrihydrite nanoparticles of a bacterial origin
The magnetic properties of the superparamagnetic ferrihydrite nanoparticles that form as a result of the vital activity of Klebsiella oxytoca bacteria are studied. Both an initial powder with an average number of iron atoms N Fe ∼ 2000–2500 in a particle and this powder after annealing at 140°C for...
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| Veröffentlicht in: | Journal of experimental and theoretical physics 2014-09, Vol.119 (3), p.479-487 |
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| creator | Balaev, D. A. Krasikov, A. A. Dubrovskii, A. A. Semenov, S. V. Bayukov, O. A. Stolyar, S. V. Iskhakov, R. S. Ladygina, V. P. Ishchenko, L. A. |
| description | The magnetic properties of the superparamagnetic ferrihydrite nanoparticles that form as a result of the vital activity of
Klebsiella oxytoca
bacteria are studied. Both an initial powder with an average number of iron atoms
N
Fe
∼ 2000–2500 in a particle and this powder after annealing at 140°C for 3 h in air are investigated. The following substantial modifications of the magnetic properties of the ferrihydrite nanoparticles are detected after annealing: the superparamagnetic blocking temperature increases from 23 to 49.5 K, and the average magnetic moment of a particle increases (as follows from the results of processing of magnetization curves). The particles have antiferromagnetic ordering, and the magnetic moment resulting in the superparamagnetism of the system appears due to random spin decompensation inside the particle. For this mechanism, the number of uncompensated spins is proportional to the number of magnetically active atoms raised to the one-half power, and this relation holds true for the samples under study at a good accuracy. The possible causes of the detected shift of magnetic hysteresis loops at low temperatures upon field cooling are discussed. |
| doi_str_mv | 10.1134/S1063776114080044 |
| format | Article |
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Klebsiella oxytoca
bacteria are studied. Both an initial powder with an average number of iron atoms
N
Fe
∼ 2000–2500 in a particle and this powder after annealing at 140°C for 3 h in air are investigated. The following substantial modifications of the magnetic properties of the ferrihydrite nanoparticles are detected after annealing: the superparamagnetic blocking temperature increases from 23 to 49.5 K, and the average magnetic moment of a particle increases (as follows from the results of processing of magnetization curves). The particles have antiferromagnetic ordering, and the magnetic moment resulting in the superparamagnetism of the system appears due to random spin decompensation inside the particle. For this mechanism, the number of uncompensated spins is proportional to the number of magnetically active atoms raised to the one-half power, and this relation holds true for the samples under study at a good accuracy. The possible causes of the detected shift of magnetic hysteresis loops at low temperatures upon field cooling are discussed.</description><identifier>ISSN: 1063-7761</identifier><identifier>EISSN: 1090-6509</identifier><identifier>DOI: 10.1134/S1063776114080044</identifier><language>eng</language><publisher>Moscow: Pleiades Publishing</publisher><subject>Annealing ; Classical and Quantum Gravitation ; Disorder ; Elementary Particles ; Iron oxides ; Magnetic hysteresis ; Magnetic properties ; Magnetism ; Magnetization ; Nanoparticles ; Order ; Particle and Nuclear Physics ; Phase Transition in Condensed System ; Physics ; Physics and Astronomy ; Powders ; Quantum Field Theory ; Relativity Theory ; Solid State Physics</subject><ispartof>Journal of experimental and theoretical physics, 2014-09, Vol.119 (3), p.479-487</ispartof><rights>Pleiades Publishing, Inc. 2014</rights><rights>COPYRIGHT 2014 Springer</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c361t-3f030f17e6287edcfed59a7150473b5474b33d09f6ddd7367161ecda05e356363</citedby><cites>FETCH-LOGICAL-c361t-3f030f17e6287edcfed59a7150473b5474b33d09f6ddd7367161ecda05e356363</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1134/S1063776114080044$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1134/S1063776114080044$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,776,780,27901,27902,41464,42533,51294</link.rule.ids></links><search><creatorcontrib>Balaev, D. A.</creatorcontrib><creatorcontrib>Krasikov, A. A.</creatorcontrib><creatorcontrib>Dubrovskii, A. A.</creatorcontrib><creatorcontrib>Semenov, S. V.</creatorcontrib><creatorcontrib>Bayukov, O. A.</creatorcontrib><creatorcontrib>Stolyar, S. V.</creatorcontrib><creatorcontrib>Iskhakov, R. S.</creatorcontrib><creatorcontrib>Ladygina, V. P.</creatorcontrib><creatorcontrib>Ishchenko, L. A.</creatorcontrib><title>Magnetic properties and the mechanism of formation of the uncompensated magnetic moment of antiferromagnetic ferrihydrite nanoparticles of a bacterial origin</title><title>Journal of experimental and theoretical physics</title><addtitle>J. Exp. Theor. Phys</addtitle><description>The magnetic properties of the superparamagnetic ferrihydrite nanoparticles that form as a result of the vital activity of
Klebsiella oxytoca
bacteria are studied. Both an initial powder with an average number of iron atoms
N
Fe
∼ 2000–2500 in a particle and this powder after annealing at 140°C for 3 h in air are investigated. The following substantial modifications of the magnetic properties of the ferrihydrite nanoparticles are detected after annealing: the superparamagnetic blocking temperature increases from 23 to 49.5 K, and the average magnetic moment of a particle increases (as follows from the results of processing of magnetization curves). The particles have antiferromagnetic ordering, and the magnetic moment resulting in the superparamagnetism of the system appears due to random spin decompensation inside the particle. For this mechanism, the number of uncompensated spins is proportional to the number of magnetically active atoms raised to the one-half power, and this relation holds true for the samples under study at a good accuracy. The possible causes of the detected shift of magnetic hysteresis loops at low temperatures upon field cooling are discussed.</description><subject>Annealing</subject><subject>Classical and Quantum Gravitation</subject><subject>Disorder</subject><subject>Elementary Particles</subject><subject>Iron oxides</subject><subject>Magnetic hysteresis</subject><subject>Magnetic properties</subject><subject>Magnetism</subject><subject>Magnetization</subject><subject>Nanoparticles</subject><subject>Order</subject><subject>Particle and Nuclear Physics</subject><subject>Phase Transition in Condensed System</subject><subject>Physics</subject><subject>Physics and Astronomy</subject><subject>Powders</subject><subject>Quantum Field Theory</subject><subject>Relativity Theory</subject><subject>Solid State Physics</subject><issn>1063-7761</issn><issn>1090-6509</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNp9kcFqHDEMhoeSQNOkD9Cbrz1MKq9n7JljCG0TSAkk7XnQ2vKsw9oebC80D9N3rYdtC6EQfJCl__slkJrmA4dLzkX36ZGDFEpJzjsYALruTXPGYYRW9jCerH8p2lV_27zL-QkAhg2MZ82vbzgHKk6zJcWFUnGUGQbDyo6YJ73D4LJn0TIbk8fiYliTVT0EHf1CIWMhw_zfPj56CmWFMBRnKaX4T1szt3s2yRViAUNcsE7U-zpz5dkWdaHkcM9icrMLF82pxX2m93_iefPjy-fv1zft3f3X2-uru1YLyUsrLAiwXJHcDIqMtmT6ERXvoVNi23eq2wphYLTSGKOEVFxy0gahJ9FLIcV5c3nsO-OeJhdsLAl1fYa80zGQdbV-JYahl71UXTV8fGGoTKGfZcZDztPt48NLlh9ZnWLOiey0JOcxPU8cpvV403_Hq57N0ZMrG2ZK01M8pFB38IrpN0Tfnro</recordid><startdate>20140901</startdate><enddate>20140901</enddate><creator>Balaev, D. A.</creator><creator>Krasikov, A. A.</creator><creator>Dubrovskii, A. A.</creator><creator>Semenov, S. V.</creator><creator>Bayukov, O. A.</creator><creator>Stolyar, S. V.</creator><creator>Iskhakov, R. S.</creator><creator>Ladygina, V. P.</creator><creator>Ishchenko, L. A.</creator><general>Pleiades Publishing</general><general>Springer</general><scope>AAYXX</scope><scope>CITATION</scope><scope>ISR</scope></search><sort><creationdate>20140901</creationdate><title>Magnetic properties and the mechanism of formation of the uncompensated magnetic moment of antiferromagnetic ferrihydrite nanoparticles of a bacterial origin</title><author>Balaev, D. A. ; Krasikov, A. A. ; Dubrovskii, A. A. ; Semenov, S. V. ; Bayukov, O. A. ; Stolyar, S. V. ; Iskhakov, R. S. ; Ladygina, V. P. ; Ishchenko, L. A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c361t-3f030f17e6287edcfed59a7150473b5474b33d09f6ddd7367161ecda05e356363</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Annealing</topic><topic>Classical and Quantum Gravitation</topic><topic>Disorder</topic><topic>Elementary Particles</topic><topic>Iron oxides</topic><topic>Magnetic hysteresis</topic><topic>Magnetic properties</topic><topic>Magnetism</topic><topic>Magnetization</topic><topic>Nanoparticles</topic><topic>Order</topic><topic>Particle and Nuclear Physics</topic><topic>Phase Transition in Condensed System</topic><topic>Physics</topic><topic>Physics and Astronomy</topic><topic>Powders</topic><topic>Quantum Field Theory</topic><topic>Relativity Theory</topic><topic>Solid State Physics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Balaev, D. A.</creatorcontrib><creatorcontrib>Krasikov, A. A.</creatorcontrib><creatorcontrib>Dubrovskii, A. A.</creatorcontrib><creatorcontrib>Semenov, S. V.</creatorcontrib><creatorcontrib>Bayukov, O. A.</creatorcontrib><creatorcontrib>Stolyar, S. V.</creatorcontrib><creatorcontrib>Iskhakov, R. S.</creatorcontrib><creatorcontrib>Ladygina, V. P.</creatorcontrib><creatorcontrib>Ishchenko, L. A.</creatorcontrib><collection>CrossRef</collection><collection>Gale In Context: Science</collection><jtitle>Journal of experimental and theoretical physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Balaev, D. A.</au><au>Krasikov, A. A.</au><au>Dubrovskii, A. A.</au><au>Semenov, S. V.</au><au>Bayukov, O. A.</au><au>Stolyar, S. V.</au><au>Iskhakov, R. S.</au><au>Ladygina, V. P.</au><au>Ishchenko, L. A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Magnetic properties and the mechanism of formation of the uncompensated magnetic moment of antiferromagnetic ferrihydrite nanoparticles of a bacterial origin</atitle><jtitle>Journal of experimental and theoretical physics</jtitle><stitle>J. Exp. Theor. Phys</stitle><date>2014-09-01</date><risdate>2014</risdate><volume>119</volume><issue>3</issue><spage>479</spage><epage>487</epage><pages>479-487</pages><issn>1063-7761</issn><eissn>1090-6509</eissn><abstract>The magnetic properties of the superparamagnetic ferrihydrite nanoparticles that form as a result of the vital activity of
Klebsiella oxytoca
bacteria are studied. Both an initial powder with an average number of iron atoms
N
Fe
∼ 2000–2500 in a particle and this powder after annealing at 140°C for 3 h in air are investigated. The following substantial modifications of the magnetic properties of the ferrihydrite nanoparticles are detected after annealing: the superparamagnetic blocking temperature increases from 23 to 49.5 K, and the average magnetic moment of a particle increases (as follows from the results of processing of magnetization curves). The particles have antiferromagnetic ordering, and the magnetic moment resulting in the superparamagnetism of the system appears due to random spin decompensation inside the particle. For this mechanism, the number of uncompensated spins is proportional to the number of magnetically active atoms raised to the one-half power, and this relation holds true for the samples under study at a good accuracy. The possible causes of the detected shift of magnetic hysteresis loops at low temperatures upon field cooling are discussed.</abstract><cop>Moscow</cop><pub>Pleiades Publishing</pub><doi>10.1134/S1063776114080044</doi><tpages>9</tpages></addata></record> |
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| subjects | Annealing Classical and Quantum Gravitation Disorder Elementary Particles Iron oxides Magnetic hysteresis Magnetic properties Magnetism Magnetization Nanoparticles Order Particle and Nuclear Physics Phase Transition in Condensed System Physics Physics and Astronomy Powders Quantum Field Theory Relativity Theory Solid State Physics |
| title | Magnetic properties and the mechanism of formation of the uncompensated magnetic moment of antiferromagnetic ferrihydrite nanoparticles of a bacterial origin |
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