Magnetic easy axis switching in ultrathin Co/Cu(110) films

1997 ◽  
Vol 475 ◽  
Author(s):  
S. Hope ◽  
E. Gu ◽  
M. Tselepi ◽  
J.A.C. Bland
Keyword(s):  
Kerr Effect ◽  
Easy Axis ◽  
Gas Adsorption ◽  
Uniaxial Anisotropy ◽  
Anisotropy Constant ◽  
Effective Anisotropy ◽  
Magnetic Easy Axis ◽  
Residual Gas ◽  
Axis Switching ◽  
Stm Images

AbstractWe have studied the magnetic properties of the Co/Cu(110) system at 300K, using the magneto-optic Kerr effect. After a given deposition of Co in the thickness range 5ML<dCo<40ML, the M-H loop is observed to evolve continuously in time until the magnetic easy axis has switched 90° from the [001] to [1–10] direction. We attribute this behaviour to the reversal in sign of the effective in-plane uniaxial anisotropy constant, due to the adsorption of submonolayer quantities of a residual gas from the UHV environment. STM images reveal the growth of elongated Co island structures preferentially oriented along the [001] direction providing ‘step like’ edge sites for gas adsorption. We find the easy axis can be switched back to the [001] direction by depositing a submonolayer Cu overlayer, and that for relatively thick Co films (>15ML) the Cu overlayer can cause the magnetisation to take up intermediate angles. We analyse this behaviour using a simple model of the effective anisotropy energies.

scholarly journals Correlation-driven eightfold magnetic anisotropy in a two-dimensional oxide monolayer

2020 ◽  
Vol 6 (15) ◽  
pp. eaay0114 ◽  
Author(s):  
Zhangzhang Cui ◽  
Alexander J. Grutter ◽  
Hua Zhou ◽  
Hui Cao ◽  
Yongqi Dong ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Easy Axis ◽  
Uniaxial Anisotropy ◽  
Spin Reorientation ◽  
Spin Orbit ◽  
Two Dimensional ◽  
Orbital Ordering ◽  
Magnetic Easy Axis ◽  
Spin Orbit Interactions ◽  
Spin Switching

Engineering magnetic anisotropy in two-dimensional systems has enormous scientific and technological implications. The uniaxial anisotropy universally exhibited by two-dimensional magnets has only two stable spin directions, demanding 180° spin switching between states. We demonstrate a previously unobserved eightfold anisotropy in magnetic SrRuO3 monolayers by inducing a spin reorientation in (SrRuO3)1/(SrTiO3)N superlattices, in which the magnetic easy axis of Ru spins is transformed from uniaxial 〈001〉 direction (N < 3) to eightfold 〈111〉 directions (N ≥ 3). This eightfold anisotropy enables 71° and 109° spin switching in SrRuO3 monolayers, analogous to 71° and 109° polarization switching in ferroelectric BiFeO3. First-principle calculations reveal that increasing the SrTiO3 layer thickness induces an emergent correlation-driven orbital ordering, tuning spin-orbit interactions and reorienting the SrRuO3 monolayer easy axis. Our work demonstrates that correlation effects can be exploited to substantially change spin-orbit interactions, stabilizing unprecedented properties in two-dimensional magnets and opening rich opportunities for low-power, multistate device applications.

Electric field controlled domain wall dynamics and magnetic easy axis switching in liquid gated CoFeB/MgO films

2017 ◽  
Vol 122 (13) ◽  
pp. 133907 ◽  
Author(s):  
Y. T. Liu ◽  
S. Ono ◽  
G. Agnus ◽  
J.-P. Adam ◽  
S. Jaiswal ◽  
...  
Keyword(s):  
Domain Wall ◽  
Electric Field ◽  
Easy Axis ◽  
Domain Wall Dynamics ◽  
Magnetic Easy Axis ◽  
Axis Switching

Magnetostriction of First and Second Order Magnetite Samples and its Relation to the Magnetic Easy Axis Switching

2012 ◽  
Vol 194 ◽  
pp. 120-123 ◽  
Author(s):  
Akyana Britwum ◽  
Tomasz Kolodziej ◽  
Waldemar Tokarz ◽  
Janusz Przewoźnik ◽  
Czesław Kapusta ◽  
...  
Keyword(s):  
Easy Axis ◽  
Large Change ◽  
Field Application ◽  
Second Order ◽  
Transition Regime ◽  
Magnetization Process ◽  
Verwey Transition ◽  
Magnetic Easy Axis ◽  
Axis Switching ◽  
Strong Expansion

Magnetic field (up to 8T) and temperature (10-300K) dependence of size of Zn doped magnetite samples Fe3-xZnxO4(x=0.008, 0.022, i.e. falling within first and second order Verwey transition regime) were measured by the strain gauge method. Both samples experienced shrinking on cooling through the Verwey transition along monoclinic c axis, while the strong expansion was found for the 1storder sample in the a-b direction, unlike in the 2ndorder sample. Magnetostriction of both samples is very small and limited to low fields only, concomitant with magnetization process. However, field application perpendicular to c axis and at T slightly below the Verwey transition temperature TV results in a large change of dimensions, coinciding with the axis switching process.

Magnetic and Microstructure Study of Thin Films of FeCuNbMoSiB FINEMET Alloy

2016 ◽  
Vol 870 ◽  
pp. 322-327 ◽  
Author(s):  
I.A. Zakharchuk ◽  
E. Mikhalitsyna ◽  
Erkki Lähderanta
Keyword(s):  
Thin Films ◽  
Easy Axis ◽  
Anisotropy Constant ◽  
Effective Anisotropy ◽  
Resistivity Measurements ◽  
Glass Substrates ◽  
Corning Glass ◽  
Post Annealing ◽  
Effective Anisotropy Constant ◽  
The Magnetic Field

Thin films of FeCuNbMoSiB have been sputtered on Corning glass substrates with thicknesses varying from 10 to 200 nm with post annealing at 450 °C and 550 °C. Annealing in the presence of the magnetic field applied along the plane of a substrate develops an uniaxial magnetic anisotropy with the in-plane easy axis. Estimation of the effective anisotropy constant from the magnetization measurements gave Keff = 3.23 kJ/m3. Structure and surface of the films were investigated with the X-ray powder diffraction (XRD), resistivity measurements, and Raman spectroscopy. XRD and resistivity analyses show that thermal annealing at 550 °C improves the crystalline fraction and Fe-Si grain size. Raman spectra identified hematite, goethite, magnetite, as well as graphite contamination of film surfaces.

Magnetic easy-axis switching in Pt/Co/Pt sandwiches induced by nitrogen ion beam irradiation

2004 ◽  
Vol 95 (12) ◽  
pp. 8030-8034 ◽  
Author(s):  
T. Blon ◽  
G. Ben Assayag ◽  
D. Chassaing ◽  
D. Hrabovsky ◽  
J. F. Bobo ◽  
...  
Keyword(s):  
Easy Axis ◽  
Ion Beam ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Magnetic Easy Axis ◽  
Nitrogen Ion ◽  
Axis Switching

scholarly journals Residual Gas Adsorption and Desorption in the Field Emission of Titanium-Coated Carbon Nanotubes

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2937 ◽  
Author(s):  
Huzhong Zhang ◽  
Detian Li ◽  
Peter Wurz ◽  
Yongjun Cheng ◽  
Yongjun Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Photoelectron Spectroscopy ◽  
Gas Adsorption ◽  
Mass Spectrometry Analysis ◽  
Emission Characteristic ◽  
Spectrometry Analysis ◽  
Pristine Cnts ◽  
Xps Characterization ◽  
Residual Gas

Titanium (Ti)-coated multiwall carbon nanotubes (CNTs) emitters based on the magnetron sputtering process are demonstrated, and the influences of modification to CNTs on the residual gas adsorption, gas desorption, and their field emission characteristic are discussed. Experimental results show that Ti nanoparticles are easily adsorbed on the surface of CNTs due to the “defects” produced by Ar+ irradiation pretreatment. X-ray photoelectron spectroscopy (XPS) characterization showed that Ti nanoparticles contribute to the adsorption of ambient molecules by changing the chemical bonding between C, Ti, and O. Field emission of CNTs coated with Ti nanoparticles agree well with the Fowler–Nordheim theory. The deviation of emission current under constant voltage is 6.3% and 8.6% for Ti-CNTs and pristine CNTs, respectively. The mass spectrometry analysis illustrated that Ti-coated CNTs have a better adsorption capacity at room temperature, as well as a lower outgassing effect than pristine CNTs after degassing in the process of field emission.

Expansion and Collapse of Domains With Reverse Magnetization in (Ga,Mn)As Epilayers With Perpendicular Magnetic Easy Axis

2007 ◽  
Vol 43 (6) ◽  
pp. 3022-3024 ◽  
Author(s):  
A. Dourlat ◽  
C. Gourdon ◽  
V. Jeudy ◽  
C. Testelin ◽  
K. Khazen ◽  
...  
Keyword(s):  
Easy Axis ◽  
Magnetic Easy Axis ◽  
Reverse Magnetization

scholarly journals Influence of the electrodeposition potential on the crystallographic structure and effective magnetic easy axis of cobalt nanowires

RSC Advances ◽  
2016 ◽  
Vol 6 (17) ◽  
pp. 14266-14272 ◽  
Author(s):  
M. I. Irshad ◽  
N. M. Mohamed ◽  
M. Z. Abdullah ◽  
M. S. M. Saheed ◽  
A. Mumtaz ◽  
...  
Keyword(s):  
Easy Axis ◽  
Aluminium Oxide ◽  
Deposition Potential ◽  
Crystallographic Structure ◽  
Cobalt Nanowires ◽  
Magnetic Easy Axis

Cobalt nanowires (NWs) have been synthesized by electrodeposition inside the pores of anodized aluminium oxide templates, at different values of applied deposition potential.

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