Terahertz Spin-Conductance Spectroscopy: Probing Coherent and Incoherent Ultrafast Spin Tunneling

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10486162" target="_blank" >RIV/00216208:11320/24:10486162 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ldNkiLuvXQ" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=ldNkiLuvXQ</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.nanolett.4c00498" target="_blank" >10.1021/acs.nanolett.4c00498</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Terahertz Spin-Conductance Spectroscopy: Probing Coherent and Incoherent Ultrafast Spin Tunneling

Popis výsledku v původním jazyce

Thin-film stacks F/H consisting of a ferromagnetic-metal layer F and a heavymetallayer H are spintronic model systems. Here, we present a method to measure theultrabroadband spin conductance across a layer X between F and H at terahertz frequencies,which are the natural frequencies of spin-transport dynamics. We apply our approach to MgOtunneling barriers with thickness d = 0-6 Å. In the time domain, the spin conductance Gs hastwo components. An instantaneous feature arises from processes like coherent spin tunneling.Remarkably, a longer-lived component is a hallmark of incoherent resonant spin tunnelingmediated by MgO defect states, because its relaxation time grows monotonically with d to asmuch as 270 fs at d = 6.0 Å. Our results are in full agreement with an analytical model. Theyindicate that terahertz spin-conductance spectroscopy will yield new and relevant insights intoultrafast spin transport in a wide range of spintronic nanostructures.

Název v anglickém jazyce

Terahertz Spin-Conductance Spectroscopy: Probing Coherent and Incoherent Ultrafast Spin Tunneling

Popis výsledku anglicky

Thin-film stacks F/H consisting of a ferromagnetic-metal layer F and a heavymetallayer H are spintronic model systems. Here, we present a method to measure theultrabroadband spin conductance across a layer X between F and H at terahertz frequencies,which are the natural frequencies of spin-transport dynamics. We apply our approach to MgOtunneling barriers with thickness d = 0-6 Å. In the time domain, the spin conductance Gs hastwo components. An instantaneous feature arises from processes like coherent spin tunneling.Remarkably, a longer-lived component is a hallmark of incoherent resonant spin tunnelingmediated by MgO defect states, because its relaxation time grows monotonically with d to asmuch as 270 fs at d = 6.0 Å. Our results are in full agreement with an analytical model. Theyindicate that terahertz spin-conductance spectroscopy will yield new and relevant insights intoultrafast spin transport in a wide range of spintronic nanostructures.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Nano Letters

ISSN

1530-6984

e-ISSN

1530-6992

Svazek periodika

24

Číslo periodika v rámci svazku

26

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

7852-7860

Kód UT WoS článku

001252871400001

EID výsledku v databázi Scopus

2-s2.0-85196791552