Proximal magnetometry in thin films using betaNMR.
Low energy ion implantation of hyperpolarized radioactive magnetic resonance probes allows the NMR study of thin film heterostructures by enabling depth-resolved measurements on a nanometer lengthscale. By stopping the probe ions in a layer adjacent to a layer of interest, it is possible to study magnetic fields proximally. Here we show that, in the simplest case of a uniformly magnetized layer, this yields an unperturbed in situ frequency reference. We also discuss demagnetization contributions to measured shifts for this case. With a simple illustrative calculation, we show how a nonuniformly magnetized layer causes a strongly depth-dependent line broadening in an adjacent layer. We then give some experimental examples of resonance line broadening in heterostructures.
Xu
M
M
TRIUMF, 4004 Wesbrook Mall, Vancouver, Canada V6T 2A3.
Hossain
M D
MD
Saadaoui
H
H
Parolin
T J
TJ
Chow
K H
KH
Keeler
T A
TA
Kiefl
R F
RF
Morris
G D
GD
Salman
Z
Z
Song
Q
Q
Wang
D
D
MacFarlane
W A
WA
D000465:Algorithms; D003198:Computer Simulation; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008280:Magnetics; D008567:Membranes, Artificial; D008956:Models, Chemical; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*
D008567:Membranes, Artificial