Results 261 to 270 of about 396,063 (301)

Ferromagnetic resonance of exchange-coupled magnetic layers

Physical Review B, 1988
The ferromagnetic resonance-line shapes, fields, and intensities of exchange coupled magnetic multilayers are calculated as a function of exchange coupling and number of layers. We find that the number of magnetic excitations equals the number of layer pairs that make up the layered structure.
openaire   +2 more sources

Wireless Power Transfer via Strongly Coupled Magnetic Resonances

Science, 2007
Using self-resonant coils in a strongly coupled regime, we experimentally demonstrated efficient nonradiative power transfer over distances up to 8 times the radius of the coils. We were able to transfer 60 watts with ∼40% efficiency over distances in excess of 2 meters.
André, Kurs, Aristeidis, Karalis, Robert, Moffatt, J D, Joannopoulos, Peter, Fisher, Marin, Soljacic   +5 more
openaire   +2 more sources

Nuclear magnetic resonance in microfluidic environments using inductively coupled radiofrequency resonators

Journal of Magnetic Resonance, 2009
Inductively coupled radiofrequency resonators can provide NMR signals from small samples wirelessly and with high sensitivity. We explore the achievable sensitivity depending on the resonator's Q-factor and its cross-inductance to the NMR probe. Even for small resonators with modest Q, the sensitivity can be close to that of directly (impedance ...
Utz, Marcel, Monazami, Reza
openaire   +3 more sources

Strongly coupled resonance magnetic for RFID applications

2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013
Wireless power and data transfer (WPDT) through the strongly coupled magnetic resonance (SCMR) method at an RFID frequency is reported. The proposed system consists of four single resonant loops, in contrast to the two resonant loops traditionally used in RFID.
Olutola Jonah, Stavros V. Georgakopoulos, Shun Yao   +2 more
openaire   +1 more source

Magnetically coupled resonators for rate integrating gyroscopes

IEEE SENSORS 2014 Proceedings, 2014
This work demonstrates for the first time the use of magnetic field to couple mechanical resonators that can be separated by long distances (8mm in this work) compared to coulombic/electrostatic coupling (~ 1 nm – 1 μm depending on the surface charge density or E-field).
Pradeep Pai, Hoorad Pourzand, Massood Tabib-Azar   +2 more
openaire   +1 more source

Parametric resonance of a magnetically coupled harvester

Active and Passive Smart Structures and Integrated Systems XII, 2018
Parametric excitation has been investigated for several years as an effective way to drive a structure parametrically into large distinctive responses. However, parametric resonance requires a minimum threshold of excitation to be triggered. To reduce the threshold, we propose a two-degree-of-freedom vibration system.
Shahrzad Towfighian, Wei Yang
openaire   +1 more source

Double Magnetic Resonance of Coupled Spins

Journal of Applied Physics, 1967
A perturbation procedure is introduced to solve for the probability amplitudes of a system of coupled spins under the action of two rf magnetic fields; one a large saturating signal, the other a relatively weak one. The power absorbed when the saturating signal connects two states in the system is affected by the presence of the second signal ...
openaire   +1 more source

Wireless charging technology using magnetically coupled resonators

2011 IEEE 33rd International Telecommunications Energy Conference (INTELEC), 2011
We are successful to charge the iPod touch using magnetically coupled resonators. The wireless charging was possible within the distance variation within 10 cm. The signal was generated and amplified with the balanced power amplifier structure which is useful for isolating the reflected power near the operation frequency of 9.4 MHz.
Yong-Hae Kim, Seung-Youl Kang, Sanghoon Cheon, Myung-Lae Lee, Taehyoung Zyung   +4 more
openaire   +1 more source

Magnetic resonance lineshapes in exchange coupled paramagnets

Physics Letters A, 1969
Abstract Systematic discrepancies between predicted and observed exchange narrowed EPR and NMR resonance linewidths in MnF 2 , KMnF 3 , RbMnF 3 are examined. A model lineshape based upon the 2nd, 4th and 6th moments is proposed which improves agreement with experiment.
J.E. Gulley, B.G. Silbernagel, V. Jaccarino   +2 more
openaire   +1 more source

Magnetic Resonance Coupling Phenomenon and Basic Characteristics

2020
The purpose of this chapter is to examine the characteristics of magnetic resonance coupling. We start with a basic coil shape, and then introduce an open type and short type. Next, we explain the characteristics of magnetic resonance coupling power transmission.
openaire   +1 more source