Topic
Relaxation (NMR)
About: Relaxation (NMR) is a research topic. Over the lifetime, 29342 publications have been published within this topic receiving 689851 citations.
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TL;DR: A novel imaging technique is described that yields all of the observable properties of the binary spin‐bath model for magnetization transfer and is demonstrated for in vivo studies of the human head.
Abstract: We describe a novel imaging technique that yields all of the observable properties of the binary spin-bath model for magnetization transfer (MT) and demonstrate this method for in vivo studies of the human head. Based on a new model of the steady-state behavior of the magnetization during a pulsed MT-weighted imaging sequence, this approach yields parametric images of the fractional size of the restricted pool, the magnetization exchange rate, the T(2) of the restricted pool, as well as the relaxation times in the free pool. Validated experimentally on agar gels and samples of uncooked beef, we demonstrate the method's application on two normal subjects and a patient with multiple sclerosis.
380 citations
TL;DR: In this article, the authors measured the transverse relaxation times of in-phase coherence, T,( N,,Y), and of antiphase coherence for the heteronucleus N. The proposed approach has the advantage that it does not rely on any a priori model assumptions about the shape of J(w).
380 citations
TL;DR: In this article, the authors demonstrate the existence of an enhanced rate of angular momentum relaxation in nearly Keplerian star clusters, such as those found in the centers of galactic nuclei containing massive black holes.
379 citations
TL;DR: In this article, a method for highly sensitive indirect detection of nuclear magnetic resonance of nuclei having a low gyromagnetic ratio using pulse techniques is presented, which employs a coherent transfer of transverse magnetization from the nuclei of interest to nuclei with high gyromagnetic ratio for which the free induction decay, S (t 2 ), is observed as a function of the length of the time interval, t 1, between imposition of transversal magnetization upon the nucleus of interest and transfer of magnetization to the observed nuclei.
378 citations
TL;DR: In this article, a generalized stochastic Landau-Lifshitz equation and its corresponding Fokker-Planck equation were proposed for the magnetization dynamics in the presence of spin-transfer torques.
Abstract: We propose a generalized stochastic Landau-Lifshitz equation and its corresponding Fokker-Planck equation for the magnetization dynamics in the presence of spin-transfer torques. Since the spin-transfer torque can pump a magnetic energy into the magnetic system, the equilibrium temperature of the magnetic system is ill defined. We introduce an effective temperature based on a stationary solution of the Fokker-Planck equation. In the limit of high-energy barriers, the law of thermal agitation is derived. We find that the N\'eel-Brown relaxation formula remains valid as long as we replace the temperature by an effective one that is linearly dependent on the spin torque. We carry out the numerical integration of the stochastic Landau-Lifshitz equation to support our theory. Our results agree with existing experimental data.
378 citations