scholarly journals Minority spin condensate in the spin-polarized superfluid 3He A1 phase

Nature ◽  
2006 ◽  
Vol 444 (7121) ◽  
pp. 909-912 ◽  
Author(s):  
A. Yamaguchi ◽  
S. Kobayashi ◽  
H. Ishimoto ◽  
H. Kojima
Keyword(s):  
Superfluid 3He ◽  
Minority Spin ◽  
Spin Polarized

Spin Polarized Photoemission from Fe On CU(100)

1991 ◽  
Vol 231 ◽  
Author(s):  
D.P. Pappas ◽  
K.-P. KÄmper ◽  
B.P. Miller ◽  
H. Hopster ◽  
D.E. Fowler ◽  
...  
Keyword(s):  
Low Energy ◽  
Photoemission Spectroscopy ◽  
Universal Curve ◽  
Exchange Splitting ◽  
Attenuation Length ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Minority Spin ◽  
Spin Polarized ◽  
The Difference ◽  
Majority Spin

AbstractThe spin resolved electronic structure of ultra-thin Fe films on Cu(100) was investigated using spin polarized angle resolved photoemission spectroscopy. All exchange splitting of the Fe ∆s band of 2.5 eV is observed for photon energies between 20 and 30 eV. ∆ peak at 6 eV binding energy which has been previously identified as a many-electron resonance was observed only after contamination of the films with oxygen. In addition, the spin dependent attenuation lengths for electrons in Fe were measured at 11, 19, and 40 eV above Ef. The attenuation length for the minority spin electrons was found to be shorter than that of the majority spin electrons. The difference between the two attenuation lengths was shown to increase at low energy. Short attenuation lengths of ≃3 monolayer were measured at II eV. The large increase of the attenuation length at low energy which is expected from the “universal curve” is not observed in Fe.

Spin Polarized Superfluid 3He A1

2008 ◽  
Vol 77 (11) ◽  
pp. 111001 ◽  
Author(s):  
Harry Kojima ◽  
Hidehiko Ishimoto
Keyword(s):  
Superfluid 3He ◽  
Spin Polarized

scholarly journals Shift of the collective mode of polarized graphene on a substrate using spin-sensitive response theory

2019 ◽  
Vol 59 (1) ◽  
Author(s):  
Dominik Kreil ◽  
Michaela Haslhofer ◽  
Helga M. Böhm
Keyword(s):  
Collective Mode ◽  
Near Field ◽  
Plasmon Mode ◽  
Charge Carriers ◽  
Semiconductor Heterostructures ◽  
Response Functions ◽  
Interband Transitions ◽  
S Wave ◽  
Minority Spin ◽  
Spin Polarized

The growing precision of optical and scattering experiments necessitates a better understanding of the influence of damping onto the collective mode of sheet electrons. As spin-polarized systems are of particular interest for spintronic applications, we here report spin-sensitive linear response functions of graphene, which give access to chargeand spin-density related excitations. We further calculate the reflectivity of graphene on an SiO2 surface, a setup used in s-wave scanning near-field microscopy. Increasing the partial spin-polarization of the graphene charge carriers leads to a significant broadening and shift of the plasmon mode, due to single-particle interband transitions of the minority spin carriers. We also predict an antiresonance in the longitudinal magnetic response function, similar to that of semiconductor heterostructures.

Spin-Polarized Density of States and Electron Tunnelling from the CO/Al2O3 Interface

1997 ◽  
Vol 492 ◽  
Author(s):  
D. Nguyen-Manh ◽  
E.Yu. Tsymbal ◽  
D. G. Pettifor ◽  
C. Arcangeli ◽  
R. Tank ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Density Of States ◽  
Fermi Energy ◽  
Electron Tunneling ◽  
Band Structure Calculations ◽  
Minority Spin ◽  
Spin Polarized ◽  
Structure Calculations ◽  
Tunnelling Current ◽  
Majority Spin

ABSTRACTIn order to elucidate the mechanism of spin-polarized electron tunneling in thin-film ferromagnet-insulator junctions, self-consistent band structure calculations of the CO/Al2O3 interface have been performed using a new LMTO technique. Since the results of the calculations are very sensitive to the distance between the Co and Al planes, we have minimised the total energy with respect to this distance. Our calculations show that at the Fermi energy a strong bonding between the 3d-electrons of Co with the sp-electrons of Al at the interface can have an important influence on the spin polarization of the layer-projected density of states (LPDOS) of inner Al and O layers. Since the Fermi energy lies within the minority-spin d-band of Co but above the majority-spin d-band, the sp-d bonding results in a smaller LPDOS of the minority-spin electrons of the interfacial Al layers in comparison to that of the majority-spin electrons. This asymmetry in the LPDOS extends to the inner Al2O3 layers implying a positive spin polarization of the tunneling density of states. The result is consistent with experimental observations on tunnelling from cobalt through alumina where positive values of the spin polarization of the tunnelling current were measured.

Spin Polarized Photoemission Studies of Quantum well States in Thin Films

1993 ◽  
Vol 313 ◽  
Author(s):  
P.D. Johnson ◽  
N.B. Brookes ◽  
Y. Chang ◽  
K. Garrison
Keyword(s):  
Thin Films ◽  
Electronic Structure ◽  
Quantum Well ◽  
Noble Metals ◽  
Tight Binding ◽  
Binding Energies ◽  
Cu Films ◽  
Minority Spin ◽  
Spin Polarized ◽  
Quantum Well States

ABSTRACTSpin polarized photoemission is used to study the electronic structure of noble metals deposited on ferromagnetic substrates. Studies of Ag deposited on an Fe (001) substrate reveal a series of minority spin interface or quantum well states with binding energies dependent on the thickness of the silver. Similar behavior is observed for Cu films deposited on a fee Co (001) substrate. Tight-binding Modeling reproduces many of the observations and shows that hybridization of the sp-bands with the noble metal d-bands cannot be ignored.

Spin-Polarized Positron Annihilation Study on Some Ferromagnets

2017 ◽  
Vol 373 ◽  
pp. 65-70 ◽  
Author(s):  
Hui Li ◽  
Masaki Maekawa ◽  
A. Miyashita ◽  
Atsuo Kawasuso
Keyword(s):  
Positron Annihilation ◽  
First Principles ◽  
Theoretical Calculations ◽  
Heusler Alloys ◽  
Structure Calculation ◽  
Band Structure Calculation ◽  
Half Metallicity ◽  
Minority Spin ◽  
Spin Polarized ◽  
Positron Annihilation Study

We briefly review the spin-polarized positron annihilation experiments on some ferromagnets (Fe, Co, Ni, Gd, Co2MnSi, Co2MnAl and NiMnSb) using positron beams generated with 68Ge-68Ga sources. The differential DBAR spectra between majority and minority spin electrons are well interpreted by the first principles band structure calculation. This further provides information about the half-metallicity of the Heusler alloys. The surfaces of Fe, Co and Ni are more negatively spin-polarized, that is, there are more majority than minority spin electrons. To explain the observed spin polarization quantitatively, detailed theoretical calculations and further experiments are required.

scholarly journals Spin Polarized Photoemission Studies of Surfaces and Thin Films

1991 ◽  
Vol 231 ◽  
Author(s):  
Peter D. Johnson ◽  
N.B. Brookes ◽  
Y. Chang
Keyword(s):  
Binding Energy ◽  
First Principles ◽  
Magnetic Coupling ◽  
Interface State ◽  
First Principles Calculation ◽  
Layer By Layer ◽  
Minority Spin ◽  
Interfacial Electronic Structure ◽  
Spin Polarized ◽  
Magnetic States

AbstractSpin polarized photoemission is used to study the magnetic states associated with the clean iron (001) surface. These studies reveal evidence for a minority spin surface state in agreement with a first principles calculation. Studies of the same surface with silver and chromium epitaxial overlayers reveal evidence for interface states derived from this state found on the clean surface. In the case of the silver overlayer the binding energy of the new state is found to be dependent on the layer by layer thickness of the overlayer. With chromium overlayers the binding energy for the same interface state does not show the same thickness dependence. However a second interface state is observed immediately below the Fermi level. These changes in the interfacial electronic structure have implications for any modelling of magnetic coupling in multilayers dependent on the magnetic properties of the interface.

Spin-polarized Scanning Electron Microscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 768-769
Author(s):  
Kazuyuki Koike ◽  
Hideo Matsuyama
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Speed ◽  
Magnetic Thin Films ◽  
Electron Spin Polarization ◽  
Acquisition Time ◽  
Magnetization Direction ◽  
Spin Polarized ◽  
Conventional Methods ◽  
Scanning Electron

Spin-polarized scanning electron microscopy (spin SEM), where the secondary electron spin polarization is used as the image signal, is a novel technique for magnetic domain observation. Since its first development by Koike and Hayakawa in 1984, several laboratories have extensively studied this technique and have greatly improved its capability for data extraction and its range of applications. This paper reviews the progress over the last few years.Almost all the high expectations initially held for spin SEM have been realized. A spatial resolution of several hundreds angstroms has been attained, which is nearly one order of magnitude higher than that of conventional methods for thick samples. Quantitative analysis of magnetization direction has been performed more easily than with conventional methods. Domain observation of the surface of three-dimensional samples has been confirmed to be possible. One of the drawbacks, a long image acquisition time, has been eased by combining highspeed image-signal processing with high speed scanning, although at the cost of image quality. By using spin SEM, the magnetic structure of a 180 degrees surface Neel wall, magnetic thin films, multilayered films, magnetic discs, etc., have been investigated.

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