Are insulating LiF barriers relevant for spin-polarized tunnelling applications? Insights from first-principles calculations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10327276" target="_blank" >RIV/00216208:11320/16:10327276 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/0022-3727/49/30/305302" target="_blank" >http://dx.doi.org/10.1088/0022-3727/49/30/305302</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/0022-3727/49/30/305302" target="_blank" >10.1088/0022-3727/49/30/305302</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Are insulating LiF barriers relevant for spin-polarized tunnelling applications? Insights from first-principles calculations

Popis výsledku v původním jazyce

Structural, electronic and magnetic properties of Fe/LiF (0 0 1) interfaces and spin-polarized transport properties of Fe/LiF/Fe (001) heterostructures are studied by means of self-consistent atomistic first-principles calculations. Total energy calculations performed for various interfacial geometries show that the Fe/LiF (001) interface with Fe atoms located above anionic sites is the most stable. F-Fe and Li-Fe substitutional intermixings at Fe/LiF (001) interfaces are not energetically favourable, but F accumulation in the interstitial void spaces at Fe/LiF (001) interfaces is possible. The magnetism of interfacial Fe atoms is robust. The majority-spin ferromagnetic state conductances decay rapidly with respect to the barrier thickness, while the minority-spin ones have very large contributions at specific hot spots and play a major role in the transport properties. Depending on the interfacial geometry, tunnelling magnetoresistance ratios ranging from 460%-2400% are evidenced. Interfacial interdiffusion can affect the transport properties. The exchange coupling between Fe electrodes through LiF barriers is negligible.

Název v anglickém jazyce

Are insulating LiF barriers relevant for spin-polarized tunnelling applications? Insights from first-principles calculations

Popis výsledku anglicky

Structural, electronic and magnetic properties of Fe/LiF (0 0 1) interfaces and spin-polarized transport properties of Fe/LiF/Fe (001) heterostructures are studied by means of self-consistent atomistic first-principles calculations. Total energy calculations performed for various interfacial geometries show that the Fe/LiF (001) interface with Fe atoms located above anionic sites is the most stable. F-Fe and Li-Fe substitutional intermixings at Fe/LiF (001) interfaces are not energetically favourable, but F accumulation in the interstitial void spaces at Fe/LiF (001) interfaces is possible. The magnetism of interfacial Fe atoms is robust. The majority-spin ferromagnetic state conductances decay rapidly with respect to the barrier thickness, while the minority-spin ones have very large contributions at specific hot spots and play a major role in the transport properties. Depending on the interfacial geometry, tunnelling magnetoresistance ratios ranging from 460%-2400% are evidenced. Interfacial interdiffusion can affect the transport properties. The exchange coupling between Fe electrodes through LiF barriers is negligible.

Druh

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

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

—

Projekt

<a href="/cs/project/GJ15-08740Y" target="_blank" >GJ15-08740Y: Generování spinových proudů na femtosekundové časové škále</a><br>

Návaznosti

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

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Journal of Physics D - Applied Physics

ISSN

0022-3727

e-ISSN

—

Svazek periodika

49

Číslo periodika v rámci svazku

30

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

—

Kód UT WoS článku

000383895300014

EID výsledku v databázi Scopus

2-s2.0-84984645294