Ferromagnetic resonance and magnetic force microscopy evidence for above room temperature ferromagnetism in Mn doped Si made by a solid state sintering process

2012 ◽  
Vol 152 (7) ◽  
pp. 603-605 ◽  
Author(s):  
Rajen Patel ◽  
Frank J. Owens
Keyword(s):  
Solid State ◽  
Ferromagnetic Resonance ◽  
Magnetic Force Microscopy ◽  
Room Temperature ◽  
Magnetic Force ◽  
Room Temperature Ferromagnetism ◽  
Sintering Process ◽  
Force Microscopy ◽  
Solid State Sintering ◽  
Mn Doped

Perpendicular magnetic domains of a thin Ag/Fe/Ag film observed by magnetic force microscopy at room temperature

2002 ◽  
Vol 250 ◽  
pp. 32-38 ◽  
Author(s):  
R Hoffmann ◽  
D.E Bürgler ◽  
P.J.A van Schendel ◽  
H.J Hug ◽  
S Martin ◽  
...  
Keyword(s):  
Magnetic Force Microscopy ◽  
Room Temperature ◽  
Magnetic Force ◽  
Magnetic Domains ◽  
Force Microscopy ◽  
Ag Film

Magnetic Films of Cobalt/Aluminum Electrodeposited from the Room Temperature Molten Salts AlCl3-BPC-CoCl2

2004 ◽  
Vol 59 (5) ◽  
pp. 519-524 ◽  
Author(s):  
Chao-Chen Yang ◽  
Te-Ho Wu ◽  
Min-Fong Shu
Keyword(s):  
Thin Films ◽  
Magnetic Force Microscopy ◽  
Room Temperature ◽  
Magnetic Force ◽  
Current Method ◽  
Magnetic Films ◽  
Deposition Potential ◽  
Force Microscopy ◽  
Atomic Force ◽  
Increasing Temperature

Abstract The electric conductivities of molten mixtures of aluminum chloride-butylpyridinium chloridecobalt chloride (AlCl3-BPC-CoCl2) were measured using a computerized direct-current method. The conductivities of all the melts increased with increasing temperature. The electrodeposition of Co/Al films from the AlCl3-BPC melt containing a small amount of CoCl2 has been studied by cyclic voltammetry. Compact and smooth Co/Al thin films could be obtained at a deposition potential of −0.4 V. The surface morphology and the composition of the electrodeposited thin films were studied using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The magnetic properties of the deposited thin films have been investigated via magnetic force microscopy (MFM) and vibrating sample magnetometry (VSM). Higher magnetization and smooth domains of Co/Al layers could be obtained at the deposition potentials of −0.1 V and −0.4 V, respectively.

Peculiarities in Optical and Magneto-Optical Spectra of GaMnSb Layers Grown by Laser Ablation

2012 ◽  
Vol 190 ◽  
pp. 562-565 ◽  
Author(s):  
E.A. Gan'shina ◽  
L.L. Golik ◽  
V.I. Kovalev ◽  
Z.E. Kun’kova ◽  
M.P. Temiryazeva ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Kerr Effect ◽  
Magnetic Force Microscopy ◽  
Room Temperature ◽  
Magnetic Force ◽  
Interband Transitions ◽  
Spectral Ellipsometry ◽  
Force Microscopy ◽  
Mn Content ◽  
Laser Ablation Technique

Optical and magneto-optical properties of GaMnSb layers fabricated on GaAs (001) substrates by laser ablation technique were studied using spectral ellipsometry (E =1.24-3.25 eV) and the transversal Kerr effect (TKE) (E = 0.5 4.2 eV) as well as atomic and magnetic force microscopy. Spectra of the constituents of the diagonal components of the permittivity tensor as well as TKE depended substantially on the layer fabrication conditions. At room temperature a strong resonant band was observed in the TKE spectra for the GaMnSb layers with low Mn content in the energy range E 0.5-1.5 eV. This resonant TKE band was explained by excitation of surface plasmons in MnSb nanoclusters, which arose during the growth of the layers. In the energy region E >1.5 eV the TKE spectra were related to interband transitions in MnSb inclusions.

Features of Surface Morphology and Magnetic Properties of Sm0.5R0.5Fe2 (R = Tb, Gd) Compounds

2020 ◽  
Vol 312 ◽  
pp. 261-269
Author(s):  
Galina Aleksandrovna Politova ◽  
Tatiana P. Kaminskaya ◽  
Alexey Karpenkov ◽  
Nikolay Yu. Pankratov ◽  
Maksim Ganin ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Force Microscopy ◽  
Room Temperature ◽  
Magnetic Force ◽  
Magnetic Domain ◽  
Surface Topology ◽  
Partial Replacement ◽  
Force Microscopy ◽  
Atomic Force ◽  
Comprehensive Study

A comprehensive study of the structure and phase composition, magnetostrictive and magnetic properties of the (Sm0.5R0.5)Fe2 (R = Gd, Tb) compounds was performed. The effect of partial replacement of samarium by gadolinium and terbium on the microstructure of the surface, the temperature of phase transitions, the magnitude of magnetostrictive deformations and magnetization was studied. Using atomic force and magnetic force microscopy, the surface topology at the micro and nanoscale was established, and information on the magnetic domain structure at room temperature was obtained.

Magnetic Force Microscopy Imaging of Current Paths

2002 ◽  
Vol 738 ◽  
Author(s):  
R. Yongsunthon ◽  
A. Stanishevsky ◽  
P. J. Rous ◽  
E. D. Williams
Keyword(s):  
Magnetic Force Microscopy ◽  
Room Temperature ◽  
Magnetic Force ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Microscopy Imaging ◽  
Gold Nanowire ◽  
Force Microscopy ◽  
Current Path ◽  
Dc Current

ABSTRACTWe demonstrate Magnetic Force Microscopy (MFM) imaging, at room temperature in air, of a 0.25mA DC current path in a 140nm-wide gold nanowire. The nanowire was created by focused ion beam milling of a 12μm wide Cr/Au line of 20nm/110nm Cr/Au thickness. Iterative fitting of the MFM data to an idealized model of the structure yielded a nanowire resistivity a factor of 3.5 higher than that of a control Cr/Au region which was unaffected by the ion beam processing. MFM imaging of an ion-implant patterned line shows current deflection around the implant region.

scholarly journals Evidence for Stable High-Temperature Ferromagnetism in Fluorine-Treated C60

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Rajen Patel ◽  
Frank J. Owens
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Magnetic Force Microscopy ◽  
Room Temperature ◽  
Magnetic Force ◽  
Ac Susceptibility ◽  
Ferromagnetic Material ◽  
Molecular Orbital Calculations ◽  
Force Microscopy ◽  
Field Dependent

It is shown by magnetic field dependent ac susceptibility, magnetic force microscopy, and ferromagnetic resonance that exposure of C60 to fluorine at 160°C produces a stable ferromagnetic material with a Curie temperature well above room temperature. The exposure to fluorine is accomplished by decomposing a fluorine-rich polymer, trifluorochloroethylene [F2C–CFCl]n, which has C60 imbedded in it. Based on previous experimental observations and molecular orbital calculations, it is suggested that the ferromagnetism is arising from crystals of C60–F.

scholarly journals Influence of transition metal ions on multiferroic properties of lead-free NBT–BT ceramics

2019 ◽  
Vol 09 (06) ◽  
pp. 1950045 ◽  
Author(s):  
S. Shanmuga Sundari ◽  
R. Dhanasekaran
Keyword(s):  
Magnetic Force Microscopy ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Magnetic Force ◽  
Transition Metal Ions ◽  
Solid State Reaction Method ◽  
Dielectric Analysis ◽  
Conventional Solid State Reaction ◽  
Force Microscopy ◽  
Ferromagnetic Domains

Using the conventional solid-state reaction method, 0.5[Formula: see text]wt.% of MnO2-, NiO-, Cr2O3-, Fe2O3- and Co2O3-added 0.94[Formula: see text][Formula: see text]TiO3 (NBT)–0.06BaTiO3 (BT) ceramics were prepared. The perovskite nature of the prepared ceramics was analyzed by powder XRD and the surface morphology was studied by means of SEM. The dielectric analysis was carried out from room temperature to [Formula: see text]C at various frequencies and the diffusive transition at the dielectric maxima confirmed the relaxor nature of the ceramics. Creation of oxygen vacancies by the possible substitution of ferromagnetic impurities decreased the dielectric constant and piezoelectric constant ([Formula: see text]. The co-existence of ferromagnetism and the ferroelectricity was observed in the Mn, Ni, Co and Cr-added NBT–BT ceramics. The magnetic force microscopy (MFM) analysis was carried out to study the ferromagnetic domains in the prepared ceramic.

Effect of Sintering Temperature on Structure and Properties of Al2O3/Ni-P Composites with Interpenetrating Phases

2005 ◽  
Vol 106 ◽  
pp. 161-166
Author(s):  
J. Michalski ◽  
M.J. Woźniak ◽  
K. Konopka ◽  
J. Bieliński ◽  
Stanislaw Gierlotka ◽  
...  
Keyword(s):  
Magnetic Force Microscopy ◽  
Room Temperature ◽  
Magnetic Force ◽  
Sintering Temperature ◽  
Metallic Phase ◽  
Alumina Powder ◽  
Fabrication Method ◽  
Structure And Properties ◽  
Force Microscopy ◽  
High Electric Conductivity

An Al2O3/Ni-P composite was formed by hot pressing of alumina powder, coated with chemically plated nano Ni-P. The powders were consolidated at room temperature, 600 and 1000oC. The consolidated specimens were studied by SEM, TEM/HRTM, MFM (magnetic force microscopy) and tested or hardness. It was found that the fabrication method results in a structure of interpenetrating phases of high electric conductivity and that samples consolidated at room temperature and sintered at 600oC retain the nanometric grain size of the metallic phase. Hardness measurements are discussed in terms of the fabrication temperature and structure of the composites.

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