Spin Seebeck effect in epsilon-Fe2O3 thin films with high coercive field

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F18%3A10389562" target="_blank" >RIV/00216208:11310/18:10389562 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1063/1.5045304" target="_blank" >https://doi.org/10.1063/1.5045304</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.5045304" target="_blank" >10.1063/1.5045304</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Spin Seebeck effect in epsilon-Fe2O3 thin films with high coercive field

Popis výsledku v původním jazyce

We present the experimental observation of the spin Seebeck effect in epsilon-Fe2-xAlxO3 (x = 0 and 0.3) thin films with Pt detection layer. The films with 40-70 nm thicknesses were deposited by a spin-coating method on Y:ZrO2(100) substrates. The prepared films are highly oriented with the easy magnetic a-axis parallel to the film surface. The magnetic hysteresis loops measured for x = 0 at room temperature with the magnetic field parallel to the surface exhibit coercive fields up to 11.6 kOe, which is so far the highest value of epsilon-Fe2O3 thin films. The spin Seebeck signal for x = 0 increases proportionally to the film&apos;s thickness, which means that the critical thickness corresponding to the magnon propagation length is greater than 70 nm. Al substitution enhances the spin Seebeck signal, while it reduces the coercive field. The shape and coercive field of the spin Seebeck hysteresis loops closely resemble magnetization loops for single phase samples. A difference is encountered in the case of films with a small amount (1-2 vol. %) of secondary soft ferrimagnetic phase, where their presence is revealed in the magnetization loops by a constricted shape, in contrast to the spin Seebeck loops, where no constriction is observed. The large coercive field makes doped e-Fe2O3 a suitable material for applications of the spin Seebeck effect without an external magnetic field.

Název v anglickém jazyce

Spin Seebeck effect in epsilon-Fe2O3 thin films with high coercive field

Popis výsledku anglicky

We present the experimental observation of the spin Seebeck effect in epsilon-Fe2-xAlxO3 (x = 0 and 0.3) thin films with Pt detection layer. The films with 40-70 nm thicknesses were deposited by a spin-coating method on Y:ZrO2(100) substrates. The prepared films are highly oriented with the easy magnetic a-axis parallel to the film surface. The magnetic hysteresis loops measured for x = 0 at room temperature with the magnetic field parallel to the surface exhibit coercive fields up to 11.6 kOe, which is so far the highest value of epsilon-Fe2O3 thin films. The spin Seebeck signal for x = 0 increases proportionally to the film&apos;s thickness, which means that the critical thickness corresponding to the magnon propagation length is greater than 70 nm. Al substitution enhances the spin Seebeck signal, while it reduces the coercive field. The shape and coercive field of the spin Seebeck hysteresis loops closely resemble magnetization loops for single phase samples. A difference is encountered in the case of films with a small amount (1-2 vol. %) of secondary soft ferrimagnetic phase, where their presence is revealed in the magnetization loops by a constricted shape, in contrast to the spin Seebeck loops, where no constriction is observed. The large coercive field makes doped e-Fe2O3 a suitable material for applications of the spin Seebeck effect without an external magnetic field.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

<a href="/cs/project/GA16-04340S" target="_blank" >GA16-04340S: Oxidové nanomagnety, jejich vlastnosti a interakce s biologickými systémy</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Journal of Applied Physics

ISSN

0021-8979

e-ISSN

—

Svazek periodika

124

Číslo periodika v rámci svazku

21

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

—

Kód UT WoS článku

000452538100015

EID výsledku v databázi Scopus

2-s2.0-85058113744