scholarly journals Strong Interlayer Magnon-Magnon Coupling in Magnetic Metal-Insulator Hybrid Nanostructures

2018 ◽  
Vol 120 (21) ◽  
Author(s):  
Jilei Chen ◽  
Chuanpu Liu ◽  
Tao Liu ◽  
Yang Xiao ◽  
Ke Xia ◽  
...  
Keyword(s):  
Hybrid Nanostructures ◽  
Metal Insulator ◽  
Magnetic Metal

scholarly journals Manipulation of Coupling and Magnon Transport in Magnetic Metal-Insulator Hybrid Structures

2020 ◽  
Vol 13 (6) ◽  
Author(s):  
Yabin Fan ◽  
P. Quarterman ◽  
Joseph Finley ◽  
Jiahao Han ◽  
Pengxiang Zhang ◽  
...  
Keyword(s):  
Hybrid Structures ◽  
Metal Insulator ◽  
Magnetic Metal

Hrem Characterization of Magnetic Tunnel Junctions and Discontinuous Multilayers

1998 ◽  
Vol 4 (S2) ◽  
pp. 798-799
Author(s):  
David J. Smith ◽  
Fuding Ge ◽  
C.L. Piatt ◽  
S. Sankar ◽  
A.E. Berkowitz
Keyword(s):  
Room Temperature ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Cross Sectional ◽  
Metal Insulator ◽  
Magnetic Layers ◽  
Magnetic Metal ◽  
Oxide Barrier ◽  
Metal Layers

There is much current interest in the magnetotransport properties of systems consisting of two (or more) magnetic metal layers separated by thin insulating layers. Traditional magnetic tunnel junctions (MTJs) are comprised of simple ferromagnet-insulator-ferromagnet trilayer structures and the conductance depends on the relative alignments of the magnetizations in the two ferromagnets. In the case of discontinuous metal/insulator multilayers, negative magnetoresistance (MR) results from spindependent tunneling. In both types of systems, the tunneling phenomena are strongly influenced by the microstructure of the films, particularly the metal/insulator interfaces and the nature and uniformity of the thin oxide barrier layers. In this study, we have used cross-sectional HREM to characterize a variety of magnetic tunnel junctions and discontinuous multilayers.The MTJs were prepared by rf and dc magnetron sputtering onto thermally oxidized (100) silicon wafers at room temperature. The magnetic layers consisted of thin films of Co, Fe and/or CoFe alloys with thicknesses ∼ 30-50nm, and the barriers included MgO, HfO2, CoO, SiO2 as well as Al2O3 (thicknesses in the range 2-10nm).

Giant Hall Effect and Spin-Dependent Transport in Granular NiFe-SiO2 Films

1997 ◽  
Vol 475 ◽  
Author(s):  
X. Yan ◽  
A. B. Pakhomov ◽  
X. N. Jing ◽  
S. K. Wong
Keyword(s):  
Hall Effect ◽  
Nanocomposite Films ◽  
Metal Insulator ◽  
Sio2 Films ◽  
Hall Resistivity ◽  
Spin Dependent Transport ◽  
Extraordinary Hall Effect ◽  
Magnetic Metal ◽  
Dependent Transport ◽  
Giant Hall Effect

ABSTRACTIn granular NiFe-SiO2 films which display giant Hall effect, extraordinary Hall resistivity ρxys, normal Hall resistivity ρxyo, and magnetoresistivity δρ, were all found to follow power lav dependencies on resistivity ρ. Namely, -ρxys ∼ ρ0.81, -ρxyo ∼ ρ0.64 and -δρ ∼ ρ1.15. We propose that the presence of nanometer sized particles in the percolating conduction channels gives rise to I giant enhancement for both ordinary and extraordinary Hall effect in magnetic metal-insulator nanocomposite films. This physical picture describes qualitatively well the general features of GHE, and its correlation with resistivity and magnetoresistivity.

scholarly journals Microwave Magnon-Plasmon-Polaritons in the Ferromagnetic Metal–Screened Insulator Structure

2020 ◽  
Vol 65 (10) ◽  
pp. 939
Author(s):  
V. Yu. Malyshev ◽  
I. V. Zavislyak ◽  
G. A. Melkov ◽  
M. O. Popov ◽  
O. V. Prokopenko
Keyword(s):  
Characteristic Frequency ◽  
Ferromagnetic Metal ◽  
Surface Electromagnetic Wave ◽  
Metal Insulator ◽  
Metal Structures ◽  
A Value ◽  
Wave Resonator ◽  
Magnetic Metal ◽  
Structure Surface ◽  
Plasmon Polaritons

A possibility for surface magnon–plasmon–polaritons (SMPPs)–coupled microwave oscillations of magnetization, electron density, and electromagnetic field–to exist in real ferromagnetic metal–insulator–ideal non-magnetic metal structures has been analyzed theoretically. The developed theory predicts that the effective formation of SMPPs is possible only at certain values of the external dc magnetic field and must be accompanied by a shift in the characteristic frequency of the resonance plasmon-polariton systems. A theoretical estimation of the frequency shift for SMPPs in the structure “surface electromagnetic wave resonator made of permalloy–vacuum–ideal metal” gives a value of ±45 MHz for a resonator with a characteristic frequency of 10 GHz, which seems sufficient for this effect to be observed experimentally.

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