Magnetoresistance of magnetic multilayers containing three types of magnetic layers

2003 ◽  
Vol 67 (9) ◽  
Author(s):  
L. A. Michez ◽  
B. J. Hickey ◽  
Smadar Shatz ◽  
Nathan Wiser
Keyword(s):  
Magnetic Multilayers ◽  
Magnetic Layers

Transport Properties in All Oxide Magnetic Multilayers

2008 ◽  
Vol 587-588 ◽  
pp. 318-322
Author(s):  
H. Sobreiro ◽  
B. Berini ◽  
N. Keller ◽  
David S. Schmool
Keyword(s):  
Transport Properties ◽  
Electrical Transport ◽  
Molecular Beam ◽  
Magnetic Layer ◽  
Magnetic Multilayers ◽  
Magnetic Multilayer ◽  
Electrical Transport Properties ◽  
Appreciable Increase ◽  
Magnetic Layers ◽  
Laser Mbe

The all oxide magnetic multilayer system [LaNiO3/SmFeO3]n (for n = 1 and 2), grown on single crystal SrTiO3(100) substrates, has been produced using the laser MBE (Molecular Beam Epitaxy) technique. We have made a systematic study of the electrical transport properties in the temperature range from 15–300K. As part of this work, we have made a detailed study of the metallic properties of the LaNiO3 layer as a function of the oxygen partial pressure (pO2) and substrate temperature (TS). We have measured magnetic layers of SmFeO3 with LaNiO3 electrodes as a function of the magnetic layer thickness (10 – 470 nm). A non-metallic behaviour is observed with evidence of a “hopping” mechanism at low temperatures. For the n = 2 multilayers, we have measured the temperature dependence of resistance for the sample series with varying LaNiO3 interlayer thickness (t = 2 – 30 nm). We observe an appreciable increase of the low temperature resistance for the interlayer thicknesses between 3.75 – 7.5 nm. This could indicate a change in coupling from ferromagnetic to antiferromagnetic between the magnetic layers.

INFLUENCE OF BIQUADRATIC INTERACTION IN THE NANO-SCALED FIBONACCI MAGNETIC MULTILAYERS

2005 ◽  
Vol 19 (15n17) ◽  
pp. 2568-2573
Author(s):  
H. L. CAI ◽  
S. S. JIANG ◽  
W. T. SHENG ◽  
L. YANG ◽  
J. DU
Keyword(s):  
Magnetic Field ◽  
Magnetic Anisotropy ◽  
Magnetic Energy ◽  
Hysteresis Loops ◽  
Fibonacci Sequence ◽  
Magnetic Multilayers ◽  
Magnetization Curves ◽  
Biquadratic Exchange ◽  
Magnetic Layers

The magnetization of the magnetic multilayers with Fibonacci sequence was studied theoretically. By considering the Zeeman, magnetic anisotropy, bilinear and biquadratic exchange energies in the multiplayer system, the angles of the magnetization between all magnetic layers were calculated numerically by minimizing the magnetic energy. The magnetization curves and hysteresis loops were obtained. By considering the different strengths of biquadratic interaction between the magnetic layers some novel phenomena appears. The magnetization in magnetic sub-layers may rotates reversibly or irreversibly by magnetic field.

scholarly journals Spin-orbit torque switching of chiral magnetization across a synthetic antiferromagnet

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Kang Wang ◽  
Lijuan Qian ◽  
See-Chen Ying ◽  
Gang Xiao
Keyword(s):  
Three Dimensional ◽  
Magnetic Multilayers ◽  
Spin Orbit ◽  
Magnetic Structures ◽  
Numerical Studies ◽  
Synthetic Antiferromagnet ◽  
Magnetic Layers ◽  
Low Dimensional ◽  
And Control ◽  
Moriya Interaction

AbstractThe interfacial Dzyaloshinskii-Moriya interaction (DMI) holds promises for design and control of chiral spin textures in low-dimensional magnets with efficient current-driven dynamics. Recently, an interlayer DMI has been found to exist across magnetic multilayers with a heavy-metal spacer between magnetic layers. This opens the possibility of chirality in these three-dimensional magnetic structures. Here we show the existence of the interlayer DMI in a synthetic antiferromagnetic multilayer with both inversion and in-plane asymmetry. We analyse the interlayer DMI’s effects on the magnetization and the current-induced spin-orbit torque (SOT) switching of magnetization through a combination of experimental and numerical studies. The chiral nature of the interlayer DMI leads to an asymmetric SOT switching of magnetization under an in-plane magnetic field. Our work paves the way for further explorations on controlling chiral magnetizations across magnetic multilayers through SOTs, which can provide a new path in the design of SOT devices.

Connection between Structure and Electronic Properties in Epitaxial Magnetic Layers

1999 ◽  
Vol 570 ◽  
Author(s):  
K. N. Altmann ◽  
J. A. Con Foo ◽  
F. J. Himpsel ◽  
J. F. Kelly ◽  
M. G. Lagally ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Kerr Effect ◽  
Magnetic Coupling ◽  
Magnetic Multilayers ◽  
X Ray Scattering ◽  
Magnetic Layers ◽  
Wide Range ◽  
Spin Polarized ◽  
Quantum Well States

ABSTRACTThis study explores the consequences of structure on the electronic properties of magnetic multilayers. Epitaxial layers of Co and Cu are grown on Cu(100) in a new deposition system that couples sputter-deposition with MBE and contains a wide range of characterization tools, including RHEED, LEED, and Kerr effect. This system can be coupled in situ to spin-polarized, angle-resolved photoemission and to resonant, magnetic X-ray scattering, both employing synchrotron radiation. The interface structure turns out to be critical in determining the coercivity and the presence of quantum well states, which determine oscillatory magnetic coupling.

Dependence of the magnetoresistance of magnetic multilayers on the number of magnetic layers

2008 ◽  
Vol 77 (1) ◽  
Author(s):  
L. A. Michez ◽  
B. J. Hickey ◽  
Smadar Shatz ◽  
Nathan Wiser
Keyword(s):  
Magnetic Multilayers ◽  
Magnetic Layers

Finite Size Effects in Magnetic Multilayers Induced by Interaction with the Substrate

2015 ◽  
Vol 233-234 ◽  
pp. 43-46
Author(s):  
M.V. Kostyuchenko
Keyword(s):  
Magnetic Moment ◽  
Uniaxial Anisotropy ◽  
Finite Size ◽  
Exchange Interactions ◽  
Magnetic Multilayers ◽  
Analytical Investigation ◽  
Finite Size Effects ◽  
Finite Difference Equations ◽  
Magnetic Layers ◽  
Significant Difference

The technique of finite difference equations is used for analytical investigation of magnetization pattern in magnetic multilayers. The magnetic multilayers with equal magnetic layers and ferrimagnetic multilayers are considered. Heisenberg and biquadratic exchange interactions and uniaxial anisotropy are taken into account. The analytical dependencies of total magnetic moment on external magnetic field are obtained taking into account the strong interaction with the substrate. The significant difference in the behavior of magnetic moment is derived for ferrimagnetic multilayers with odd and even layers number.

scholarly journals Structural Properties of Fe/Cu Magnetic Multilayers: A Monte Carlo Approach

SPIN ◽  
2018 ◽  
Vol 08 (03) ◽  
pp. 1850012
Author(s):  
Jules Berlin Nde Kengne ◽  
Bernard Fongang ◽  
Serge Zekeng
Keyword(s):  
Monte Carlo ◽  
Structural Properties ◽  
Magnetic Multilayers ◽  
The Body ◽  
Magnetic Storage ◽  
Face Centered Cubic ◽  
Magnetic Layers ◽  
Face Centered ◽  
Magnetic Storage Media ◽  
The Impact

Using atomistic Monte Carlo simulations, we investigated the impact of the interface on the structural properties of iron and copper (Fe/Cu) magnetic multilayers grown by Voronoi diagram. Interest in magnetic multilayers has recently emerged as they are shown to be promising candidates for magnetic storage media, magneto-resistive sensors and personalized medical treatment. As these artificial materials show large differences in properties compared to conventional ones, many experimental and theoretical works have been dedicated on shedding light on these differences and tremendous results have emerged. However, little is known about the influence of the interfaces on magnetic layers. Using numerical approaches, we show that the structure of each layer depends on its thickness and the interface morphology. The Fe and Cu layers can adopt either the body-centered-cubic (bcc) or face-centered-cubic (fcc) structure, while the interface can assume amorphous, bcc, fcc, or a mixture of bcc and fcc structures depending on the layer thicknesses. These results are in good agreement with the experiments. They could be helpful in understanding effects such as giant magneto-resistance from the structural perspective.

scholarly journals Multiple Walker Breakdowns in Magnetic Multilayers

2021 ◽  
Author(s):  
Joon Moon ◽  
Jaesung Yoon ◽  
Kitae Kim ◽  
Seong-Hyub Lee ◽  
Dae-Yun Kim ◽  
...  
Keyword(s):  
Domain Wall ◽  
Domain Walls ◽  
Multilayer Films ◽  
Magnetic Multilayers ◽  
Magnetic Multilayer ◽  
Phase Boundaries ◽  
Domain Wall Dynamics ◽  
Domain Wall Velocity ◽  
Magnetic Layers ◽  
Magnetic Dipole Field

Abstract Herein, we report an exotic domain-wall dynamics showing double Walker breakdowns in magnetic multilayer films composed of two magnetic layers. Such multiple Walker breakdowns are attributed to the internal magnetic dipole field, which is antisymmetric on the domain walls of the lower and upper magnetic layers. A micromagnetic simulation shows four phases of the domain-wall dynamics, which result in a phase diagram with the phase boundaries of the double Walker breakdown fields. Such double Walker breakdowns lead to two minima in the variation of the domain-wall velocity, as often observed experimentally.

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