Introduction In this chapter, we describe the spin-exchange-relaxation-free (SERF) atomic magnetometer. As the name suggests, this is an atomic magnetometer (AM) in which the effects of spin-exchange (SE) collisions on spin relaxation are effectively turned off, even at a very high rate of ...
In a K-Rb-21Ne co-magnetometer, the alkali spin ensemble couples with the noble gas spin ensemble through spin exchange interaction8, and alkali atoms are in the spin exchange relaxation free (SERF) regime9 to sensitively detect the direction of the 21Ne nuclear spin. The SERF regime has ...
We have developed a high-purity sol-gel coating for the interior surface of glass cells used for polarizing [sup 3]He by spin-exchange optical pumping. The coating is designed to minimize spin relaxation due to wall collisions. A longitudinal spin-relaxation time T[sub 1] in a sol-gel coa...
Such an increase is taken as evidence that spin-memory loss (spin relaxation) due to the FeMn is strong, and that judicious insertion of a source of spin relaxation into a multilayer with high specific resistance contacts can enhanceAΔR,the numerator of the magnetoresistance. 展开 ...
microscopy (SEM) images captured with the Zeiss Supra 40 instrument. Moreover, various magnetic measurements, including isothermal magnetization (M(H)), temperature-dependent magnetization (M(T)), and magnetic relaxation (M(t)), were conducted using a commercial SQUID magnetometer from Quantum ...
Equations are derived which describe the E.S.R. spectra of free radicals in solution when the spin exchange interaction JS1. S2 provides the dominant relaxation mechanism. It is shown that modified Bloch equations provide an adequate description if J is much greater than any frequency differences...
A longitudinal spin-relaxation timeT1in a sol-gel coated Pyrex cell of344±8hwas achieved, the longestT1we have ever recorded for a gaseous sample. Repeated trials indicated that the coating was quite robust. Results using an uncoated Pyrex cell were also quite good, although inferior to the...
This production depends critically upon three major factors: Xe wall relaxation, optical pumping light sources, and the fundamental Rb- Xe spin exchange and spin loss rates. We have experimentally explored each of these areas in turn. We find theoretically that Korringa relaxation on metal surfaces...
The resulting alkali-metal/ 131Xe spin-exchange rates were found to be comparable to the rapid 131Xe spin relaxation rates in glass cells (estimated using a model). 131Xe polarization values as high as 7.6%±1.5% were achieved at 0.37 amagat1 in a 0.1 L cell (N=8.5×1020 131Xe spins...
(1, 1) between P andεas a function of time, illustrating experimental variables includingεdetuning, ramp rates and dwell time.dA characteristic spin funnel is observed where theSH/T−state degeneracy results in a relaxation hotspot.eTheSH/T−coupling strength Δ(θ) is characterized by ...