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Astrophysical fluids, including interstellar and interplanetary medium, are magnetized and turbulent. Their appearance, evolution, and overall properties are determined by the magnetic turbulence that stirs it. We argue that examining…

天体物理学 · 物理学 2009-11-13 A. Lazarian , A. Beresnyak , H. Yan , M. Opher , Y. Liu

Changing-look active galactic nuclei (CL-AGNs) challenges the standard accretion theory owing to its rapid variability. Recent numerical simulations have shown that, for the sub-Eddington accretion case, the disk is magnetic…

高能天体物理现象 · 物理学 2023-09-11 Wen-Biao Wu , Wei-Min Gu

We have found that the current rectification effect in triple layer (double barrier) (Ga,Mn)As magnetic tunnel junctions strongly depends on the magnetization alignment. The direction as well as the amplitude of the rectification changes…

介观与纳米尺度物理 · 物理学 2015-05-27 Yoshiaki Hashimoto , Hiroaki Amano , Yasuhiro Iye , Shingo Katsumoto

The discovery of ferromagnetism in Mn doped GaAs [1] has ignited interest in the development of semiconductor technologies based on electron spin and has led to several proof-of-concept spintronic devices [2-4]. A major hurdle for realistic…

材料科学 · 物理学 2009-11-11 Dale Kitchen , Anthony Richardella , Jian-Ming Tang , Michael E. Flatte , Ali Yazdani

The standard model of Mn doping in GaAs is subjected to a coherent potential approximation (CPA) treatment. Transport coefficients are evaluated within the linear response Kubo formalism. Both normal (NHE) and anomalous contributions (AHE)…

材料科学 · 物理学 2009-11-13 Louis-Francois Arsenault , B. Movaghar , P. Desjardins , A. Yelon

We consider transport in the insulating regime of GaMnAs. We calculate the resistance, magnetoresitance and Hall effect, assuming that the Fermi energy is in the region of localized states above the valence band mobility edge. Both hopping…

材料科学 · 物理学 2009-11-13 Louis-Francois Arsenault , B. Movaghar , P. Desjardins , A. Yelon

The effects of finite magnetization and electric polarization on dissipative and non-dissipative (anomalous) transport coefficients of a chiral fluid are studied. First, using the second law of thermodynamics as well as Onsager's time…

高能物理 - 理论 · 物理学 2017-04-28 N. Sadooghi , S. M. A. Tabatabaee

We present an investigation of the magnetic behavior of epitaxial MnAs films grown on GaAs(100). We address the dependence of the magnetic moment, ferromagnetic transition temperature ($T_c$) and magnetocrystalline anisotropy constants on…

We report on the magnetic and structural properties of Ar and Mn implanted InAs epitaxial films grown on GaAs (100) by Molecular Beam Epitaxy (MBE) and the effect of Rapid Thermal Annealing (RTA) for 30 seconds at 750C. Channeling Particle…

Spontaneous formation of grains has been observed for the MnAs layer grown by means of MBE on the GaN(0001)-(1x1) surface. Electronic structure of the system was investigated in situ by resonant photoemission spectroscopy. Density of the…

Some contracting or expanding stars are thought to host a large-scale magnetic field in their radiative interior. By interacting with the contraction-induced flows, such fields may significantly alter the rotational history of the star.…

太阳与恒星天体物理 · 物理学 2022-05-18 B. Gouhier , L. Jouve , F. Lignières

In magnetic tunnel junctions based on iron oxide nanoparticles the disorder and the oxidation state of the surface spin as well as the nanoparticles functionalization play a crucial role in the magnetotransport properties. In this work, we…

Formation of MnAs quantum dots in a regular ring-like distribution has been found on MBE-grown (GaMn)As surfaces after low-temperature annealing under As capping. The Mn was supplied by out-diffusing Mn interstitials from (GaMn)As. With 5…

材料科学 · 物理学 2007-05-23 J. Sadowski , M. Adell , J. Kanski , L. Ilver , E. Janik , E. Lusakowska , J. Z. Domagala , R. Brucas , M. Hanson

The effect of the inclusion of As antisites in the diluted magnetic semiconductor (Ga,Mn)As is studied within density functional theory in the local spin density approximation. In the case of homogeneous distribution of Mn ions we find that…

材料科学 · 物理学 2025-06-10 Stefano Sanvito , Nicola A. Hill

The diffusion-controlled growth and microstructural evolution at the interface of aluminide coatings and different substrates such as Ni-base superalloys and steel are reviewed. Quantitative diffusion analysis indicates that the diffusion…

材料科学 · 物理学 2017-11-15 Aloke Paul

We address two finite size effects in perpendicular transport through magnetic multilayers. When the magnetic layer thickness in spin valves becomes of the order or smaller than the spin-flip diffusion length, structural asymmetries affect…

介观与纳米尺度物理 · 物理学 2015-06-25 Alexey A. Kovalev , Gerrit E. W. Bauer , Arne Brataas

We analyze a sample of 58 multi-wavelength, Very Long Baseline Array observations of active galactic nuclei (AGN) to determine their scattering properties. Approximately 75% of the sample consists of AGN that exhibit centimeter-wavelength…

天体物理学 · 物理学 2009-11-13 T. J. W. Lazio , R. Ojha , A. L. Fey , L. Kedziora-Chudczer , J. M. Cordes , D. L. Jauncey , J. E. J. Lovell

Current induced magnetization switching and resistance associated with domain walls pinned in nanoconstrictions have both been previously reported in (Ga,Mn)As based devices, but using very dissimilar experimental schemes and device…

介观与纳米尺度物理 · 物理学 2009-11-11 C. Gould , K. Pappert , C. Rüster , R. Giraud* , T. Borzenko , G. M. Schott , K. Brunner , G. Schmidt , L. W. Molenkamp

Previous treatments of ambipolar diffusion in star-forming molecular clouds do not consider the effects of fluctuations in the fluid fields about their mean values. This paper generalizes the ambipolar diffusion problem in molecular cloud…

天体物理学 · 物理学 2009-11-07 Marco Fatuzzo , Fred C. Adams

We demonstrate directional dependence of the self-modification of internal mesospin textures in magnetic metamaterials, arising from the coupling of the atomic- and mesoscopic length-scales. Dressing the mesospins in different directions…

介观与纳米尺度物理 · 物理学 2022-05-09 Nanny Strandqvist , Björn Erik Skovdal , Merlin Pohlit , Henry Stopfel , Vassilios Kapaklis , Björgvin Hjörvarsson
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