Physicochemical Principles Underlying the Synthesis of Granular Semiconductor–Ferromagnet Magnetic Structures Exemplified by AIIGeAs2 (AII = Zn, Cd) Materials

Autor:	A. D. Izotov, I. V. Fedorchenko, M. G. Vasil’ev, S. F. Marenkin
Rok vydání:	2019
Předmět:	010302 applied physics Materials science Magnetoresistance Spintronics General Chemical Engineering Superlattice Metals and Alloys Giant magnetoresistance 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Granular material 01 natural sciences law.invention Inorganic Chemistry Condensed Matter::Materials Science Ferromagnetism law Chemical physics 0103 physical sciences Materials Chemistry Condensed Matter::Strongly Correlated Electrons Crystallization 0210 nano-technology Eutectic system
Zdroj:	Inorganic Materials. 55:865-872
ISSN:	1608-3172 0020-1685
DOI:	10.1134/s0020168519090061
Popis:	This paper presents an analytical review that addresses physicochemical principles underlying the synthesis of granular structures in semiconductor–ferromagnet systems. Such systems comprise a II–IV–V2, II2–V3, or II–V2 compound as a semiconductor and MnAs as a ferromagnet. We demonstrate that granular magnetic structures are an alternative to superlattices in spintronic devices and can exhibit giant magnetoresistance and tunneling magnetoresistance effects. It is shown that, owing to the high carrier mobility in semiconductors, they are more attractive as matrices of granular materials than are metals or dielectrics. We have formulated the basic principles underlying the synthesis of granular structures with high magnetoresistance based on eutectic systems. Eutectic crystallization involves simultaneous crystallization of all the constituent phases, leading to the formation of an unusual, fine structure. High cooling rates are favorable for metastable crystallization. This causes a synergistic effect, stimulating nanostructuring and favoring the formation of granular structures. We present results on semiconductor–ferromagnet systems and demonstrate the possibility of producing granular magnetic structures with high magnetoresistance in such systems.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5534098e49e8a111429bddf60203f4a3 https://doi.org/10.1134/s0020168519090061 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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