Applied Physics Letters
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#1Shuo Huang (China University of Geosciences (Wuhan))H-Index: 2
#2Zhihua DongH-Index: 7
Last. Levente VitosH-Index: 57
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High-entropy functional materials are of great interest in materials science and engineering community. In this work, ab initio electronic structure calculations of the phase stability and magnetic transition temperature of AlxCr0.25MnFeCo0.25−yNiy (x = 0–0.5, y = 0–0.25) alloys were performed to screen for compositions showing promising magnetocaloric properties in the vicinity of room temperature. The selected Al0.44Cr0.25MnFeCo0.05Ni0.2 alloy was synthesized via a rapid solidification techniq...
The ability to control the alignment of liquid crystals (LCs) is a challenge that is near-universal in LC research and applications. While several practical solutions exist for controlling the azimuthal (in-plane) alignment of LCs at an interface, control over the polar, or pretilt angle of the LC often requires a combination of materials or expensive and intricate processing. Here, we introduce a method for exerting control over large pretilt angles utilizing a two-step exposure method applied ...
#1Daan M. Arroo (London Centre for Nanotechnology)H-Index: 3
#2Neil McN. AlfordH-Index: 35
Last. Jonathan D. Breeze (London Centre for Nanotechnology)
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The first solid-state masers to operate at room-temperature and ambient air-pressure were recently demonstrated using optically pumped spin-triplet states as the gain medium. In this Perspective, we briefly review the previous state-of-the-art in cryogenic solid-state masers and then discuss the development of the room-temperature solid-state maser: from the organic pentacene pulsed maser to the diamond nitrogen-vacancy continuous-wave maser. We characterize the operation of these masers as cohe...
In inverted perovskite solar cells, the [6,6]-phenyl-C61-butyric acid methyl ester (PCBM)/Ag back interface is quite important because serious recombination occurs and H2O/O2 directly attacks this interface to induce device instability. Here, bi-functional dipole layers are applied at the interface aiming at improving the charge transport and device stability simultaneously. Silane with -CF3 end group anchored on the PCBM surface induces more effective dipole effect than that with (CH2)7-CH3 end...
#6Kai Sun (UM: University of Michigan)H-Index: 42
We report on the study of InGaN nanowire green light emitting diodes (LEDs) with lateral dimensions varying from ∼1 to 10 μm. For a device with an areal size ∼3 × 3 μm2, a maximum external quantum efficiency ∼5.5% was directly measured on wafer without any packaging. The efficiency peaks at ∼3.4 A/cm2 and exhibits ∼30% drop at an injection current density ∼28 A/cm2. Detailed analysis further suggests that a maximum external quantum efficiency in the range of 30%–90% can potentially be achieved f...
#1Nagarjuna AsamH-Index: 1
#2Hirofumi SutoH-Index: 14
Last. Yuya SakurabaH-Index: 31
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Spin torque oscillators (STOs) that generate a persistent magnetization oscillation by spin-transfer torque are promising spintronic devices for various applications. In this study, we propose and experimentally demonstrate a method to characterize the magnetization dynamics of STOs using injection locking. By placing the STO near an antenna that generates a microwave magnetic field of a variable frequency ( fMW), injection locking of the STO to the microwave field occurs when fMW is in the lock...
#1Chen Ouyang (CAS: Chinese Academy of Sciences)H-Index: 1
#2Xuan Wang (CAS: Chinese Academy of Sciences)H-Index: 29
Last. Yutong Li (CAS: Chinese Academy of Sciences)H-Index: 28
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Spin current generation and injection in antiferromagnetic heterostructures opens up new perspectives in the fields of nanoelectronics, spintronics, and quantum computation. Here, we theoretically investigate terahertz spin current in an antiferromagnet (AFM)/normal metal (NM) heterostructure generated by spin pumping. Under the framework of linear response theory, we compute the alternating spin current (ac spin current) inside the NM of the heterostructure arising from the spin pumping of a re...
#1Rui Q. Yang (OU: University of Oklahoma)H-Index: 32
Based on an equivalent circuit model, a signal current in a multi-stage infrared (IR) photodetector is derived and used to discover a meaningful relation among quantum efficiency, collection efficiency, and particle conversion efficiency. Based on such a relation, it is demonstrated theoretically that the ultimate detectivities in multi-stage interband cascade infrared photodetectors (ICIPs) with identical discrete absorbers are the same as that in a conventional single-absorber detector in the ...
#1Aidar Sultanov (Aalto University)H-Index: 1
#2Marko Kuzmanović (Aalto University)
Last. Gheorghe-Sorin Paraoanu (Aalto University)H-Index: 27
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We present a method for in situ temperature measurement of superconducting quantum circuits, by using the first three levels of a transmon device to which we apply a sequence of π gates. Our approach employs projective dispersive readout and utilizes the basic properties of the density matrix associated with thermal states. This method works with an averaging readout scheme and does not require a single-shot readout setup. We validate this protocol by performing thermometry in the range of 50–20...
The resonant interaction between surface acoustic waves and ferromagnetic thin films, a phenomenon known as acoustically driven ferromagnetic resonance (ADFMR), provides a way to control magnetic resonance with purely voltage excitation. However, devices have historically been operated at harmonic frequencies, leading to large insertion losses. In this work, we demonstrate a harmonic-free drive of ADFMR devices where the strain reaches very high values, comparable to the saturation magnetostrict...
Top fields of study
Analytical chemistry
Thin film
Materials science
Condensed matter physics