Role of surface on magnetic properties of La1-xSrxMnO3+? nanocrystallites

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F15%3A00450598" target="_blank" >RIV/68378271:_____/15:00450598 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1109/TMAG.2015.2433267" target="_blank" >http://dx.doi.org/10.1109/TMAG.2015.2433267</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1109/TMAG.2015.2433267" target="_blank" >10.1109/TMAG.2015.2433267</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Role of surface on magnetic properties of La1-xSrxMnO3+? nanocrystallites

Popis výsledku v původním jazyce

The magnetic La1?xSrxMnO3 particles of 50 nm size have been prepared in the flux of sodium nitrite. A detailed magnetic study, including the neutron diffraction at zero and high pressures, has been performed for x = 0.28 and 0.37, as well as on comparative samples prepared via sol-gel route. Based on these experiments we conclude that the molten salt prepared particles show significant oxygen excess ? > 0 that can be ascribed mainly to the surface oxygen chemisorption. As a consequence, the valence of Mn ions is shifted towards a higher oxidation state and this shift probably exhibits a pronounced radial distribution in the particles. We suggest that such overdoping is an additional reason for ?magnetically dead shell in manganite nanoparticles and isalso the source of surface stress that compresses the particle core. Such compressive stress drives the magnetic ground state of the composition x = 0.37 towards a mixture of FM and A-type AFM ordering.

Název v anglickém jazyce

Role of surface on magnetic properties of La1-xSrxMnO3+? nanocrystallites

Popis výsledku anglicky

The magnetic La1?xSrxMnO3 particles of 50 nm size have been prepared in the flux of sodium nitrite. A detailed magnetic study, including the neutron diffraction at zero and high pressures, has been performed for x = 0.28 and 0.37, as well as on comparative samples prepared via sol-gel route. Based on these experiments we conclude that the molten salt prepared particles show significant oxygen excess ? > 0 that can be ascribed mainly to the surface oxygen chemisorption. As a consequence, the valence of Mn ions is shifted towards a higher oxidation state and this shift probably exhibits a pronounced radial distribution in the particles. We suggest that such overdoping is an additional reason for ?magnetically dead shell in manganite nanoparticles and isalso the source of surface stress that compresses the particle core. Such compressive stress drives the magnetic ground state of the composition x = 0.37 towards a mixture of FM and A-type AFM ordering.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/GA15-10088S" target="_blank" >GA15-10088S: Magnetismus manganitových částic a jejich útvarů</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

IEEE Transactions on Magnetics

ISSN

0018-9464

e-ISSN

—

Svazek periodika

51

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

3

Strana od-do

—

Kód UT WoS článku

000364770500003

EID výsledku v databázi Scopus

2-s2.0-84946146720