Structural and magnetic properties of CoO-Pt core-shell nanoparticles

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F14%3A00431708" target="_blank" >RIV/68378271:_____/14:00431708 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevB.89.104417" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.89.104417</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.89.104417" target="_blank" >10.1103/PhysRevB.89.104417</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Structural and magnetic properties of CoO-Pt core-shell nanoparticles

Popis výsledku v původním jazyce

Using microemulsion methods, CoO-Pt core-shell nanoparticles were synthesized and characterized by transmission electron microscopy, x-ray diffraction and x-ray absorption spectroscopy, which confirmed the existence of CoO cores and pure Pt surface layers. Using a magnetometer, the ac and dc magnetic properties were investigated over a range of temperature (2 K T 300 K), magnetic field (50 kOe), and frequency (1 kHz). The data suggest the presence of two different magnetic regimes whose onsets are identified at 6 K and 37 K, respectively. The magnetic behavior around 37 K indicates a superparamagnetic blocking of interacting nanoparticle moments. The behavior at 6 K characterizes a collective freezing of the nanoparticle moments in a superspin glass state. This co-existence of blocking and freezing behaviors is consistent with the presence of an antiferromagnetically ordered core and a magnetically disordered interlayer between the CoO core and the Pt shell.

Název v anglickém jazyce

Structural and magnetic properties of CoO-Pt core-shell nanoparticles

Popis výsledku anglicky

Using microemulsion methods, CoO-Pt core-shell nanoparticles were synthesized and characterized by transmission electron microscopy, x-ray diffraction and x-ray absorption spectroscopy, which confirmed the existence of CoO cores and pure Pt surface layers. Using a magnetometer, the ac and dc magnetic properties were investigated over a range of temperature (2 K T 300 K), magnetic field (50 kOe), and frequency (1 kHz). The data suggest the presence of two different magnetic regimes whose onsets are identified at 6 K and 37 K, respectively. The magnetic behavior around 37 K indicates a superparamagnetic blocking of interacting nanoparticle moments. The behavior at 6 K characterizes a collective freezing of the nanoparticle moments in a superspin glass state. This co-existence of blocking and freezing behaviors is consistent with the presence of an antiferromagnetically ordered core and a magnetically disordered interlayer between the CoO core and the Pt shell.

Druh

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

CEP obor

BG - Jaderná, atomová a molekulová fyzika, urychlovače

OECD FORD obor

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Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název periodika

Physical Review. B

ISSN

1098-0121

e-ISSN

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Svazek periodika

89

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

"104417-1"-"104417-10"

Kód UT WoS článku

000333125100003

EID výsledku v databázi Scopus

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