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It is well known that external magnetic fields and magnetic moments of impurities both suppress superconductivity. Here, we demonstrate that their combined effect enhances the superconductivity of a few atomic layer thick Pb films grown on…

超导电性 · 物理学 2017-12-20 Masato Niwata , Ryuichi Masutomi , Tohru Okamoto

Tuning functional properties of thin caloric films by mechanical stress is currently of high interest. In particular, a controllable magnetisation or transition temperature is desired for improved usability in magnetocaloric devices. Here,…

Employing a variational approach that takes into account electron-phonon and magnetic interactions in $La_{1-x}A_xMnO_3$ perovskites with $0<x<0.5$, the effects of the magnetic field and the oxygen isotope substitution on the phase diagram,…

Electrical manipulation of lattice, charge, and spin has been realized respectively by the piezoelectric effect, field-effect transistor, and electric field control of ferromagnetism, bringing about dramatic promotions both in fundamental…

Formation of complex polyaniline (PANI) films with diamagnetic TCNQ and paramagnetic metal ion impurities cast under applied magnetic field was studied. It has been found that the applied magnetic field affects interaction of PANI chains…

材料科学 · 物理学 2009-01-15 Oleg P. Dimitriev , Petro M. Lytvyn , Alla P. Dimitriyeva , Ostap M. Getsko

We study theoretically orbital effects of a parallel magnetic field applied to a disordered superconducting film. We find that the field reduces the phase stiffness and leads to strong quantum phase fluctuations driving the system into an…

超导电性 · 物理学 2013-07-31 Dganit Meidan , Yuval Oreg

We measured the temperature dependence of the saturation magnetization (Ms) of a (La1-xPrx)1-yCayMnO3 (x ~ 0.60, y ~ 0.33) film as a function of applied bending stress. Stress producing a compressive strain of -0.01% along the magnetic easy…

强关联电子 · 物理学 2014-11-18 Surendra Singh , M. R. Fitzsimmons , T. Lookman , H. Jeen , A. Biswas

The optical and magneto-optical properties of thin epitaxial Ni-Mn-Ga films, with thicknesses ranging from 8 to 160 nm, were investigated across the spectral range of 0.7-6.4 eV. The films were deposited by DC magnetron sputtering on MgO…

材料科学 · 物理学 2025-07-08 M. Makeš , J. Zázvorka , M. Hubert , P. Veřtát , M. Rameš , J. Zemen , O. Heczko , M. Veis

Magnetization reversal mechanisms and depth-dependent magnetic profile have been investigated in Co/Pd thin films magnetron-sputtered under continuously varying pressure with opposite deposition orders. For samples grown under increasing…

材料科学 · 物理学 2014-04-15 Peter K. Greene , B. J. Kirby , J. W. Lau , J. A. Borchers , M. R. Fitzsimmons , Kai Liu

Recently, Sharma et al. [Adv. Sci. 9, 2203473 (2022)] claimed that thin films (around 20 nm) of UO2 deposited on perovskite substrates exhibit strongly enhanced paramagnetism (called induced ferromagnetism by the authors). Moments of up to…

The magnetooptic and magnetic properties of hexagonal arrays of holes in optically thin iron films are presented. We analyze their dependence on the hole radius and compare the results to a continuous iron film of same thickness. We observe…

介观与纳米尺度物理 · 物理学 2010-02-18 E. Th. Papaioannou , V. Kapaklis , P. Patoka , M. Giersig , P. Fumagalli , A. Garcia-Martin , E. Ferreiro-Vila , G. Ctistis

The dynamics of the ferromagnetic order parameter in thin magnetic films is strongly affected by the magnetomechanical coupling at certain resonance frequencies. By solving the equation of motion of the coupled mechanical and magnetic…

其他凝聚态物理 · 物理学 2009-11-10 Alexey A. Kovalev , Gerrit E. W. Bauer , Arne Brataas

The effects of uniaxial strain on the structural, orbital, optical, and magnetic properties of LaMnO_3 are calculated using a general elastic energy expression, along with a tight-binding parameterization of the band theory. Tensile…

强关联电子 · 物理学 2009-10-31 K. H. Ahn , A. J. Millis

We have observed that CoO films grown on different substrates show dramatic differences in their magnetic properties. Using polarization dependent x-ray absorption spectroscopy at the Co L$_{2,3}$ edges, we revealed that the magnitude and…

强关联电子 · 物理学 2007-05-23 S. I. Csiszar , M. W. Haverkort , Z. Hu , A. Tanaka , H. H. Hsieh , H. -J. Lin , C. T. Chen , T. Hibma , L. H. Tjeng

Experimental evidence show that in the magnetoresistive manganite Ca_(1-x) Y_xMnO_3, ferromagnetic (FM) polarons arises in an antiferromagnetic (AF) background, as a result of the doping with Yttrium. This hypothesis is supported in this…

凝聚态物理 · 物理学 2009-11-07 H. Aliaga , M. T. Causa , M. Tovar , B. Alascio

We have studied the magneto-optical spectra of ultrathin magnetic films deposited on Si substrates coated with an oxide layer (SiOx). We find that the Kerr rotation angle and the ellipticity of ~1 nm thick CoFeB thin films, almost…

介观与纳米尺度物理 · 物理学 2018-01-18 Satoshi Sumi , Hiroyuki Awano , Masamitsu Hayashi

We show that a magnetic strip on top of a superconducting strip magnetized in a specified direction may considerably enhance the critical current in the sample. At fixed magnetization of the magnet we observed diode effect - the value of…

We report resonant x-ray scattering studies of charge and orbital order in Pr_{1-x}Ca_{x}MnO_3 with x=0.4 and 0.5. Below the ordering temperature, T_O=245 K, the charge and orbital order intensities follow the same temperature dependence,…

强关联电子 · 物理学 2009-10-31 M. v. Zimmermann , J. P. Hill , Doon Gibbs , M. Blume , D. Casa , B. Keimer , Y. Murakami , Y. Tomioka , Y. Tokura

Lanthanide metals are a particular class of magnetic materials in which the magnetic moments are carried mainly by the localized electrons of the 4f shell. They are frequently found in technically relevant systems, to achieve, e.g., high…

材料科学 · 物理学 2009-11-10 J. E. Prieto , O. Krupin , K. Doebrich , F. Heigl , G. Kaindl , K. Starke

The temperature, doping and field dependences of the magnetoresistance (MR) in Pr_(2-x)Ce_(x)CuO_(4-delta) films are reported. We distinguish between orbital MR, found when the magnetic field is applied perpendicular to the ab planes, and…

超导电性 · 物理学 2007-05-23 Y. Dagan , A. Biswas , M. C. Barr , W. M. Fisher , R. L. Greene