Magnetic nanostructures based on nanoclusters of iron oxides

Autor:	D. A. Kotikov, Vladimir Pankov, S. V. Novichikhin, V. K. Imshennik, Yu. V. Maksimov, I. P. Suzdalev, Yu. Lyubina, Maria Ivanovskaya
Rok vydání:	2010
Předmět:	Nanostructure Materials science Silica gel Transition temperature General Engineering Nanotechnology Coercivity Condensed Matter Physics Nanoclusters Magnetization chemistry.chemical_compound chemistry Chemical physics Mössbauer spectroscopy Antiferromagnetism General Materials Science
Zdroj:	Nanotechnologies in Russia. 5:817-825
ISSN:	1995-0799 1995-0780
DOI:	10.1134/s1995078010110108
Popis:	Using magnetization and Mossbauer spectroscopy, investigations of the magnetic properties of α-Fe2O3-SiO2 and γ-Fe2O3-SiO2 nanostructures, including α-Fe2O3 nanoclusters 2 nm in size and γ-Fe2O3 nanoclusters 3–4 nm in size in silica gel pores, have been conducted. For α-Fe2O3-SiO2 nanostructures, magnetic phase transitions of the first order are detected and examined with the transition temperature dependent on the nanocluster size and intercluster interactions. α-Fe2O3 nanoclusters up to 16 K remain in the noncompensated antiferromagnetic state (upper Morin point temperature). At low temperatures, α-Fe2O3 nanoclusters reveal quantum-size effects. For γ-Fe2O3-SiO2 nanostructures, supermagnetic behavior with a blocking point dependent on intercluster interactions is typical. At low temperatures, intercluster interactions lead to the appearance of a coercive force of 0.03 T.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::46ecb98a3502423946992a9022e9050f https://doi.org/10.1134/s1995078010110108 Zobrazit plný text záznamu Full text from SpringerLink