Magnetism of Ultrathin TiO2 Films Prepared by Atomic Layer Deposition

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F25%3A00640391" target="_blank" >RIV/68081723:_____/25:00640391 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/25:00142246 RIV/00216275:25310/25:39923384

Výsledek na webu

<a href="https://pubs.acs.org/doi/10.1021/acsanm.5c04214" target="_blank" >https://pubs.acs.org/doi/10.1021/acsanm.5c04214</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acsanm.5c04214" target="_blank" >10.1021/acsanm.5c04214</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Magnetism of Ultrathin TiO2 Films Prepared by Atomic Layer Deposition

Popis výsledku v původním jazyce

The discovery of room-temperature ferromagnetism (FM) in pristine TiO2 films has sparked intense debate regarding its origin, particularly in the absence of conventional magnetic dopants. Herein, for the first time, the FM of ultrathin TiO2 films grown on LaAlO3 (LAO) substrates by Atomic Layer Deposition (ALD) is investigated, yielding TiO2 thicknesses of 1, 5, and 10 nm. The findings reveal a striking thickness-dependent magnetic response, where the 5 nm films exhibit the highest ferromagnetic response, attributed to defect-driven mechanisms. Structural and spectroscopic analyses, complemented by quantum mechanical calculations, highlight the critical role of oxygen vacancies and/or defects, as well as the interface with LAO substrates, in modulating the observed FM. Notably, this work demonstrates that the ferromagnetic behavior is confined to the in-plane direction, reinforcing the role of surface and interface effects. These insights establish that defects play a key role in tuning the electronic and magnetic properties of ultrathin TiO2 films, paving the way for potential applications in next-generation magnetic devices.

Název v anglickém jazyce

Magnetism of Ultrathin TiO2 Films Prepared by Atomic Layer Deposition

Popis výsledku anglicky

The discovery of room-temperature ferromagnetism (FM) in pristine TiO2 films has sparked intense debate regarding its origin, particularly in the absence of conventional magnetic dopants. Herein, for the first time, the FM of ultrathin TiO2 films grown on LaAlO3 (LAO) substrates by Atomic Layer Deposition (ALD) is investigated, yielding TiO2 thicknesses of 1, 5, and 10 nm. The findings reveal a striking thickness-dependent magnetic response, where the 5 nm films exhibit the highest ferromagnetic response, attributed to defect-driven mechanisms. Structural and spectroscopic analyses, complemented by quantum mechanical calculations, highlight the critical role of oxygen vacancies and/or defects, as well as the interface with LAO substrates, in modulating the observed FM. Notably, this work demonstrates that the ferromagnetic behavior is confined to the in-plane direction, reinforcing the role of surface and interface effects. These insights establish that defects play a key role in tuning the electronic and magnetic properties of ultrathin TiO2 films, paving the way for potential applications in next-generation magnetic devices.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

ACS Applied Nano Materials

ISSN

2574-0970

e-ISSN

2574-0970

Svazek periodika

8

Číslo periodika v rámci svazku

41

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

20105-20114

Kód UT WoS článku

001590678900001

EID výsledku v databázi Scopus

2-s2.0-105018914693