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Proximal magnetometry in thin films using betaNMR.

M Xu¹, M D Hossain, H Saadaoui

¹TRIUMF, 4004 Wesbrook Mall, Vancouver, Canada V6T 2A3.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)

|December 29, 2007

Summary

Low energy ion implantation of hyperpolarized probes enables nanometer-scale NMR studies of thin film heterostructures. This technique provides depth-resolved magnetic field measurements, crucial for understanding magnetic materials and devices.

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Area of Science:

Materials Science
Nuclear Physics
Solid State Physics

Background:

Nuclear Magnetic Resonance (NMR) is a powerful technique for probing magnetic properties.
Studying thin film heterostructures requires depth-resolved measurements at the nanoscale.
Existing NMR techniques face challenges in achieving high spatial resolution in thin films.

Purpose of the Study:

To demonstrate the utility of low energy ion implantation of hyperpolarized radioactive probes for NMR studies of thin film heterostructures.
To establish a method for in situ, depth-resolved magnetic field measurements.
To analyze the impact of magnetic layer uniformity on NMR signal characteristics.

Main Methods:

Low energy ion implantation of hyperpolarized radioactive magnetic resonance probes.

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Utilizing the probes to perform NMR spectroscopy on adjacent layers in thin film heterostructures.

Analyzing frequency shifts and line broadening in NMR spectra.

Main Results:

Achieved depth-resolved NMR measurements on a nanometer length scale.
Demonstrated that uniformly magnetized layers provide an unperturbed in situ frequency reference.
Showed that non-uniformly magnetized layers induce depth-dependent line broadening in adjacent layers.

Conclusions:

Low energy ion implantation of hyperpolarized probes is an effective method for nanoscale NMR studies of magnetic heterostructures.
The technique allows for proximal magnetic field sensing with depth resolution.
Understanding demagnetization effects and magnetic field gradients is crucial for accurate interpretation of NMR data in such systems.