scholarly journals Magnetic resonance imaging of spin-wave transport and interference in a magnetic insulator

2020 ◽  
Vol 6 (46) ◽  
pp. eabd3556
Author(s):  
Iacopo Bertelli ◽  
Joris J. Carmiggelt ◽  
Tao Yu ◽  
Brecht G. Simon ◽  
Coosje C. Pothoven ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Spin Wave ◽  
Spin Waves ◽  
Stray Field ◽  
Dense Layer ◽  
Resonance Imaging ◽  
Wave Transport ◽  
Magnetic Insulator ◽  
Coherent Spin

Spin waves—the elementary excitations of magnetic materials—are prime candidate signal carriers for low-dissipation information processing. Being able to image coherent spin-wave transport is crucial for developing interference-based spin-wave devices. We introduce magnetic resonance imaging of the microwave magnetic stray fields that are generated by spin waves as a new approach for imaging coherent spin-wave transport. We realize this approach using a dense layer of electronic sensor spins in a diamond chip, which combines the ability to detect small magnetic fields with a sensitivity to their polarization. Focusing on a thin-film magnetic insulator, we quantify spin-wave amplitudes, visualize spin-wave dispersion and interference, and demonstrate time-domain measurements of spin-wave packets. We theoretically explain the observed anisotropic spin-wave patterns in terms of chiral spin-wave excitation and stray-field coupling to the sensor spins. Our results pave the way for probing spin waves in atomically thin magnets, even when embedded between opaque materials.

Concentration Profiles in Creaming Oil-in-Water Emulsion Layers Determined with Stray Field Magnetic Resonance Imaging

Langmuir ◽  
1997 ◽  
Vol 13 (14) ◽  
pp. 3621-3626 ◽  
Author(s):  
B. Newling ◽  
P. M. Glover ◽  
J. L. Keddie ◽  
D. M. Lane ◽  
P. J. McDonald
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Stray Field ◽  
Concentration Profiles ◽  
Resonance Imaging ◽  
Water Emulsion ◽  
Oil In Water ◽  
Oil In Water Emulsion

A Stray Field Magnetic Resonance Imaging Study of the Drying of Sodium Silicate Films

1996 ◽  
Vol 177 (1) ◽  
pp. 208-213 ◽  
Author(s):  
P.D.M. Hughes ◽  
P.J. McDonald ◽  
N.P. Rhodes ◽  
J.W. Rockliffe ◽  
E.G. Smith ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Sodium Silicate ◽  
Imaging Study ◽  
Stray Field ◽  
Magnetic Resonance Imaging Study ◽  
Resonance Imaging

Stray field magnetic resonance imaging

1998 ◽  
Vol 61 (11) ◽  
pp. 1441-1493 ◽  
Author(s):  
P J McDonald ◽  
B Newling
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Stray Field ◽  
Resonance Imaging

Influence of Grain Size on the Setting of Portland Cement: A Stray-Field Magnetic Resonance Imaging Study

2006 ◽  
Vol 514-516 ◽  
pp. 1633-1637 ◽  
Author(s):  
Teresa G. Nunes
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Portland Cement ◽  
Concrete Strength ◽  
Stray Field ◽  
Type I ◽  
Filling Material ◽  
Resonance Imaging ◽  
Early Hydration ◽  
Cement Pastes

A number of failures of large concrete structures during construction have been reported in the last decades [1]. The overestimation of concrete strength at early ages was one of the reasons for the failures. Consequently, reliable information about early age properties of the material is essential to guarantee life-time performance of structures. Portland cement is a complex heterogeneous particulate material and a full knowledge of kinetics of the hydration reactions, for example, is still missing. Gel constitutes the major phase in the hardening cement paste and the corresponding structure and dynamics represent an important contribution to determine the concrete performance. X-ray diffraction, which is widely used for the study of crystalline cement components, does not give information about the gel, amorphous, phase. Conversely, 1H stray-field magnetic resonance imaging (STRAFI-MRI) technique has proved to be a powerful tool to follow the early hydration and hardening periods of Portland cement (type I) [2-4]. The setting of cement pastes depends on parameters like the initial water/cement ratio, R, or particle size of the powder (G) and the compressive strength can be used to characterize the behaviour of hardening concrete. Water availability at the particle surfaces, which is controlled by R and G, limits cement hydration. At low R, G effects are less important. In general, it is accepted that for R<0.42, unreacted solid remain, as all the free volume is filled with hydration products [5]. For example, hydration of Portland cement pastes as a function of R (0.24-0.48) was studied using by STRAFI-MRI and hydrogen maps, from different types of water (capillary, gel or chemically bound water), enabled a spatially-resolved kinetics to be obtained [4]. Using STRAFI-MRI was now evaluated the influence of G (<70 μm to < 90 μm) on the early stages of hydration and hardening of Portland cement. Portland cement uses extend well beyond construction. For example, a mineral trioxide aggregate is now being applied as a root-end filling material, which was shown to have a similar chemical constitution to that of Portland cement except for the addition of bismuth compounds, seemingly to make the materials radiopaque for dental use [6].

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