Magnetic Annealing of Co and Co–Ni Alloys

Takahashi, Minoru; Kôno, Tatsuo

doi:10.1143/jpsj.15.936

Cited by 34 publications

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“…Cubic lattice symmetry gives rise to an inplane fourfold magnetic anisotropy in magnetic thin films. 4 However in some cases an extra uniaxial anisotropy is superimposed which may arise for several reasons such as self-shadowing effect due to oblique angle of deposition, [5][6][7] preparation under a magnetic field, 8 post-annealing under a field, 9 interface effect arising from the bonding between the magnetic film and the substrate 10, 11 etc. A growth-induced uniaxial magnetic anisotropy (UMA) was observed for Fe/MgO(001) prepared by means of oblique incidence deposition.…”

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confidence: 99%

Interplay of uniaxial and cubic anisotropy in epitaxial Fe thin films on MgO (001) substrate

2014

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Epitaxial Fe thin films were grown on annealed MgO(001) substrates at oblique incidence by DC magnetron sputtering. Due to the oblique growth configuration, uniaxial anisotropy was found to be superimposed on the expected four-fold cubic anisotropy. A detailed study of in-plane magnetic hysteresis for Fe on MgO thin films has been performed by Magneto Optic Kerr Effect (MOKE) magnetometer. Both single step and double step loops have been observed depending on the angle between the applied field and easy axis i.e. along ⟨100⟩ direction. Domain images during magnetization reversal were captured by Kerr microscope. Domain images clearly evidence two successive and separate 90° domain wall (DW) nucleation and motion along cubic easy cum uniaxial easy axis and cubic easy cum uniaxial hard axis, respectively. However, along cubic hard axis two 180° domain wall motion dominate the magnetization reversal process. In spite of having four-fold anisotropy it is essential to explain magnetization reversal mechanism in 0°< ϕ < 90° span as uniaxial anisotropy plays a major role in this system. Also it is shown that substrate rotation can suppress the effect of uniaxial anisotropy superimposed on four-fold anisotropy.

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Interplay of uniaxial and cubic anisotropy in epitaxial Fe thin films on MgO (001) substrate

2014

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“…In other investigations of the Co-Ni system, it was found that in the hexagonal region above 73% Co, K u increases by a factor of over 20 and even becomes negative beyond 95% Co [33]. These effects cannot be attributed to directional ordering of atom pairs, particularly in pure cobalt.…”

Section: Methodsmentioning

confidence: 91%

Magnetic Annealing

Slonczewski¹

1963

Magnetism

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“…[3] Different methods, such as oblique deposition [4] applying a magnetic field during deposition, [5] increasing the substrate temperature [6] and post-annealing (annealing in the presence of the magnetic field), have been adopted to induce the magnetic anisotropy. [7] The effect of oblique deposition on the magnetic anisotropy has long been established. [8,9] It is known that shadowing and steering effect, in the case of oblique deposition, leads to elongated grain structure or ripples.…”

Section: Introductionmentioning

confidence: 99%

Manipulating magnetic anisotropies of Co/MgO(001) ultrathin films via oblique deposition

Ahmad¹,

He²,

Tang³

et al. 2016

Chinese Phys. B

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We present a systematic investigation of magnetic anisotropy induced by oblique deposition of Co thin films on MgO (001) substrates by molecular beam epitaxy at different deposition angles, i.e., 0 • , 30 • , 45 • , 60 • , and 75 • with respect to the surface normal. Low energy electron diffraction (LEED), surface magneto-optical Kerr effect (SMOKE), and anisotropic magnetoresistance (AMR) setups were employed to investigate the magnetic properties of cobalt films. The values of in-plane uniaxial magnetic anisotropy (UMA) constant K u and four-fold magnetocrystalline anisotropy constant K 1 were derived from magnetic torque curves on the base of AMR results. It was found that the value of K u increases with increasing deposition angle with respect to the surface normal, while the value of K 1 remains almost constant for all the samples. Furthermore, by using MOKE results, the K u values of the films deposited obliquely were also derived from the magnetization curves along hard axis. The results of AMR method were then compared with that of hard axis fitting method (coherent rotation) and found that both methods have almost identical values of UMA constant for each sample.

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Magnetic Annealing of Co and Co–Ni Alloys

Cited by 34 publications

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Interplay of uniaxial and cubic anisotropy in epitaxial Fe thin films on MgO (001) substrate

Interplay of uniaxial and cubic anisotropy in epitaxial Fe thin films on MgO (001) substrate

Magnetic Annealing

Manipulating magnetic anisotropies of Co/MgO(001) ultrathin films via oblique deposition

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