The Mn ion-spin relaxation rate (Korringa relaxation) in the vicinity of the two-dimensional electrons (2DEG) in a Mn-based semiconductor nanostructures in a quantizing magnetic field was calculated. The Korringa relaxation is an energy-consuming process due to the difference in magnetic moments of localized and electrons spins involved. The mechanism of energy transfer between the Mn spin and ...

Spintronics attracts much attention because of the potential to build novel spin-based devices which are superior to nowadays charge-based microelectronic devices. Silicon, the main element of microelectronics, is promising for spin-driven applications. Understanding the details of the spin propagation in silicon structures is a key for building novel spin-based nanoelectronic devices. We inves...

The study of spin diffusion in solids has been of recent interest. Spin diffusion occurs by flip-flop cross-relaxation due to the S$Sj_ + S!Sj, term of the dipolar couplings among the spins (I). When a large inhomogeneous interaction also exists for the S spin system, then the flip-flop transition may not conserve energy, i.e., the resonances of the coupled spins do not overlap and are separate...

where k sd is the spin destruction rate constant between the alkali atom and some particle of type i, Γwall is the wall relaxation rate, and kdip is the He nuclear dipolar self relaxation rate constant. According to these equations, if one could provide enough laser power to keep a very high density of alkali metal polarized, then the He polarization could be, in principle, made to equilibrate ...

Low-frequency spin fluctuation dynamics in paramagnetic spinel LiV(2)O(4), a rare 3d-electron heavy-fermion system, is investigated. A parametrized self-consistent renormalization (SCR) theory of the dominant AFM spin fluctuations is developed and applied to describe temperature and pressure dependences of the low-T nuclear spin-lattice relaxation rate 1/T(1) in this material. The experimental ...

The collision-induced Zeeman relaxation rate for collisions of CaF X2Sigma(v('')=0) with 3He is measured to be Gamma(Z)=(7.7+5.4/-2.5)x10(-15) cm(3)/s at 2 K. This rate is a direct measurement of the influence of spin-rotation coupling on Zeeman relaxation in the first rotational level of CaF. The relationship of this rate to known molecular constants is consistent with recent theory of cold mo...

OBJECTIVES To study the effect of water diuresis on renal medullary and cortical oxygenation in patients with diabetes using blood oxygenation level--dependent magnetic resonance imaging (BOLD MRI). RESEARCH DESIGN AND METHODS Nine mild diabetic subjects (48 +/- 2.7 years of age, six women) and nine nondiabetic subjects of similar age and sex, all without known vascular or renal disease, were...

BACKGROUND AND PURPOSE T2 hypointensity in the basal ganglia of patients with MS has been associated with clinical progression and cognitive decline. Our objectives were the following: 1) to compare signal in T2WI, R2 (ie, 1/T2), and R2* (ie, 1/T2*) relaxation rates and quantitative susceptibility mapping; and 2) to investigate the associations among MR imaging, clinical scores, and cognitive m...

The in vitro behavior of various states of hemoglobin was examined over a wide range of concentrations. Solutions of increasing concentrations of oxyhemoglobin displayed significant increases in T1 and T2 relaxation rates that were insensitive to pH values between 6.0 and 6.9. Bovine serum albumin, which displayed a relaxation behavior nearly identical to that of oxyhemoglobin, was used to norm...

The 19F nuclear spin-lattice relaxation rate constants were measured as a function of magnetic field strength for 1,12-diaminododecane labeled at one end with a nitroxide radical and at the other with a trifluoromethyl group. The magnetic relaxation dispersion profile (MRD) reports the spectral density function appropriate to the end-to-end correlation function for the doubly labeled molecule. ...