CaF2-based UO2/Fe3O4 thin films: crystal structure and magnetic exchange bias effect

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F15%3A00469816" target="_blank" >RIV/68378271:_____/15:00469816 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389005:_____/15:00469816 RIV/00216208:11320/15:10363139

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

CaF2-based UO2/Fe3O4 thin films: crystal structure and magnetic exchange bias effect

Popis výsledku v původním jazyce

We studied the crystal structure and magnetic exchange bias (EB) effect in bilayers of an antiferromagnetic UO2 with a ferrimagnetic Fe3O4. The samples were grown on CaF2 (100) and (111) substrates. Magnetic hysteresis loops obtained after field cooling in a magnetic field of 20 kOe showed strong exchange bias with the maximum effect reaching 1.6 kOe at 5 K for the UO2/Fe3O4 sample with the thinnest magnetite layer of tFM = 80 Å (CaF2 (100) substrate). The EB obtained for the same sample on a CaF2 [111] was found to be of 25% higher. Similar trend was found in the samples with larger tFM’s. Interestingly, exchange bias did not vanish at the bulk Néel temperature of UO2. Non-zero values of EB were observed up to 125 K. This is in line with our previous study of the LaAlO3-based UO2/Fe3O4 system, where exchange bias disappeared at the Verwey transition temperature in magnetite.n

Název v anglickém jazyce

CaF2-based UO2/Fe3O4 thin films: crystal structure and magnetic exchange bias effect

Popis výsledku anglicky

We studied the crystal structure and magnetic exchange bias (EB) effect in bilayers of an antiferromagnetic UO2 with a ferrimagnetic Fe3O4. The samples were grown on CaF2 (100) and (111) substrates. Magnetic hysteresis loops obtained after field cooling in a magnetic field of 20 kOe showed strong exchange bias with the maximum effect reaching 1.6 kOe at 5 K for the UO2/Fe3O4 sample with the thinnest magnetite layer of tFM = 80 Å (CaF2 (100) substrate). The EB obtained for the same sample on a CaF2 [111] was found to be of 25% higher. Similar trend was found in the samples with larger tFM’s. Interestingly, exchange bias did not vanish at the bulk Néel temperature of UO2. Non-zero values of EB were observed up to 125 K. This is in line with our previous study of the LaAlO3-based UO2/Fe3O4 system, where exchange bias disappeared at the Verwey transition temperature in magnetite.n

Druh

O - Ostatní výsledky

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/GP13-25866P" target="_blank" >GP13-25866P: Multivrstvy na bázi uranu: struktura, magnetizmus a související elektronové vlastnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů