# UNIVERSITÀ DI PARMADIPARTIMENTO DI SCIENZE MATEMATICHE, FISICHE E INFORMATICHE

### Strumenti Sito

andrey.sidorenko:spinvalve

# Zero-field 59Co NMR spectrum of LSMO/Alq3/AlOx/Co spin valve

T = 2 K, attenuation 30 dB

# Magnetic inhomogeneities in LSMO/Alq3/AlOx/Co spin valve

## NMR fingerprint

Sample SV60 - 10 nm AlOx

Contour plot of NMR intensity S(ω,Hrf) vs Frequency (MHz) and attenuation in dB (~ RF field) where

$S(\omega,H_{rf})=K \eta sin[\Theta (\eta H_{rf} \tau)]{\omega}^2 N(\omega) {\gamma}_{n} I(I+1)/T$

Such curves image directly the structural inhomogeneities, along the frequency axis, and the magnetic stiffness, along the RF filed axis. Considering that each frequency range is associated with a specific structure or region in a composite sample, the S(ω,Hrf) curves show the structural parameters governing, at atomic scale, the magnetic stiffness of the layers or parts of the layers and the coupling strength between layers.

andrey.sidorenko/spinvalve.txt · Ultima modifica: 23/10/2008 18:06 da andrey.sidorenko