Jian-Gang Zhu

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This paper presents the time reversal adaptive interferer can-celler (TRAIC), a novel algorithm that uses time reversal techniques to cancel the presence of interferers. TRAIC is developed for broadband signals and a single emitting antenna. Experimental tests in the electromagnetic domain show the viability and the power of TRAIC.
Introduction A cluttered environment with highly scattering objects significantly enhances the difficulty for detecting targets using electromagnetic wave. In this paper, we present a novel time reversal method that nullifies the scattering objects to allow automatic focusing of the propagated electromagnetic wave on a target that is to be detected. Time(More)
− Super-resolution focusing and nulling experiments are described based on multipath-enhanced time-reversal techniques. Using these techniques, two independent 2.45 GHz signals focused at locations separated by 5 cm at a distance of 6.7 m are successfully demodulated.
FePt– MgO two phase thin films have been obtained by an alternating sputtering method at elevated temperatures. It is found that the L1 0 FePt grains grow in a columnar manner through the thickness of the film and possess a ͑001͒ perpendicular texture promoted by the ͑200͒-textured crystalline MgO underlayer. The amorphous MgO in the two phase mixture forms(More)
The order parameter of FePt thin films plays an essential role in determining such diverse materials properties as magneto-crystalline anisotropy, magnetic coercivity and magnetic recording density. Typically, the order parameter for a bulk material is obtained by measuring the X-ray integrated intensity ratio of a super lattice peak to a fundamental peak(More)
—Grain-to-grain anisotropy field variation has become one of the main causes of medium noise, especially in perpendicular thin film media. In this paper, we present an electron microscopy investigation and theoretical analysis on the grain-to-grain anisotropy field variation in various types of thin film recording media. In alloyed film media, the intrinsic(More)
In this paper we derive the generalized likelihood ratio test (GLRT) for time reversal detection. We consider a multi-static array configuration with two antenna arrays, one for transmitting and one for receiving. We examine the time reversal GLRT performance with experimental measurements in the electromagnetic domain in a highly cluttered laboratory(More)
Ultrathin Si/C graded layer to improve tribological properties of Co magnetic films Appl. Temperature and pressure dependent Mott potentials and their influence on self-limiting oxide film growth Appl. Scaling of equivalent oxide thickness of atomic layer deposited HfO2 film using RuO2 electrodes suppressing the dielectric dead-layer effect Appl. Ordered(More)
In this paper, we present a combined transmission electron microscopy study and micromagnetic modeling investigation of current granular-continuous-composite (CGC) perpendicular thin-film media. Our transmission electron microscopy-EELS elemental analysis on CoCrPt-TiOx layers found evident Cr segregation to the grain boundaries as well as in the middle of(More)
In order to improve the recording efficiency in current perpendicular recording media, it is important to reduce the distance from the head to soft underlayer. In this paper, a soft magnetic intermediate layer is proposed to partially replace the presently used Ru intermediate layer. The new soft magnetic intermediate layer serves two purposes, which are as(More)