Uniaxial magnetic anisotropy of Co films on sapphire

Metoki, Naoto; Zeidler, Th.; Stierle, Andreas; Bröhl, K.; Zabel, H.

doi:10.1016/0304-8853(93)90157-w

Cited by 30 publications

(8 citation statements)

References 22 publications

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“…The MOKE setup is described elsewhere. 15 The laser spot of a linear polarized He-Ne laser was focused to a diameter of 100 m. We have chosen an incidence angle of the laser light of about 45°to the sample surface. Therefore the measurements are sensitive to the in-plane component of the magnetization.…”

Section: Moke Measurementsmentioning

confidence: 99%

Magnetic exchange-coupling effects in asymmetric trilayer structures of MBE-grown Co/Cr/Fe

et al. 1996

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We present results of anisotropy and exchange-coupling studies of asymmetric Co/Cr/Fe trilayers and superlattices grown by molecular beam epitaxy on Cr͑001͒/Mg͑001͒ buffers and substrates. The magnetic properties have been investigated using both the longitudinal magneto-optical Kerr effect and ferromagnetic resonance. The hysteresis data obtained from the trilayer system were fit to a theoretical model which contains both bilinear and biquadratic coupling. The effective in-plane anisotropy was found to be of fourfold symmetry with the same easy-axis orientation for both the Fe and Co layers. An analysis of the easy-axis hysteresis loops indicates long-period oscillatory coupling and also suggests a short periodic coupling. We show that weakly antiferromagnetically coupled asymmetric films might serve as potential candidates for improved spin-valve systems.

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Section: Moke Measurementsmentioning

confidence: 99%

Magnetic exchange-coupling effects in asymmetric trilayer structures of MBE-grown Co/Cr/Fe

et al. 1996

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“…The variations of the reduced re- sis loops of TMJs on Si and MgO provide coercive fields of 33 Oe and 19 Oe, respectively, but do not depend on ϕ H varies, suggesting the absence of anisotropy. The Co layer presents a high uniaxial anisotropy of about 300 Oe, as deduced from the hard axis magnetization loop (ϕ H = 90 • ), most probably induced by the interface with the sapphire substrate [11]. The Co 2 MnGe single layer presents a complex anisotropy which cannot be simply described using a uniaxial anisotropy and complementary experiments should be done to clarify it.…”

Section: A Static Measurementsmentioning

confidence: 98%

Magnetization Dynamics in Co2MnGe/Al2O3/Co Tunnel Junctions Grown on Different Substrates

Belmeguenai¹,

Tuzcuoglu²,

Zighem³

et al. 2013

Sen Lett

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We study static and dynamic magnetic properties of Co2MnGe (13 nm)/Al2O3 (3 nm)/Co (13 nm) tunnel magnetic junctions (TMJ), deposited on various single crystalline substrates (a-plane sapphire, MgO(100), Si(111)). The results are compared to the magnetic properties of Co and of Co2MnGe single films lying on sapphire substrates. X-rays diffraction always shows a (110) orientation of the Co2MnGe films. Structural observations obtained by high resolution transmission electron microscopy confirmed the high quality of the TMJ grown on sapphire. Our vibrating sample magnetometry measurements reveal in-plane anisotropy only in samples grown on a sapphire substrate. Depending on the substrate, the ferromagnetic resonance spectra of the TMJs, studied by the microstrip technique, show one or two pseudo-uniform modes. In the case of MgO and of Si substrates only one mode is observed: it is described by magnetic parameters (g-factor, effective magnetization, in-plane magnetic anisotropy) derived in the frame of a simple expression of the magnetic energy density; these parameters are practically identical to those obtained for the Co single film. With a sapphire substrate two modes are present: one of them does not appreciably differ from the observed mode in the Co single film while the other one is similar to the mode appearing in the Co2MnGe single film: their magnetic parameters can thus be determined independently, using a classical model for the energy density in the absence of interlayer exchange coupling. arXiv:1301.6563v1 [cond-mat.mtrl-sci]

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“…It has been demonstrated that the crystal structure and magnetic anisotropy ͑MA͒ of the magnetic thin films may depend strongly on the underlying substrates or buffer layers. 2,3 In a previous work, the authors reported the magnetic properties of Co/Cr films and multilayers. [4][5][6][7] In this investigation we study the novel fabrication and structural transformation ͑hcp to fcc͒ of metastable hcp Ni 80 Fe 20 (1100) films grown on Co͑1100͒ and Cr͑211͒.…”

Section: ͓S0021-8979͑98͒53711-5͔mentioning

confidence: 98%

Magnetic and structural characterizations of HCP permalloy films grown by molecular beam epitaxy

Huang

1998

Journal of Applied Physics

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An hcp metastable phase of Ni80Fe20(11̄00) structure has been grown as high-quality epitaxial films on Co(11̄00) and Cr(211) planes. The epilayers of Ni80Fe20 grow as hcp structure up to a critical thickness of ∼100 Å, and the further layers transform to twinned fcc structure. Magneto-optical Kerr effect study indicates that the hcp Ni80Fe20(11̄00) layers exhibit strong crystalline induced uniaxial magnetic anisotropy with easy axis along the hcp[0001] direction. The subsequent fcc Ni80Fe20 layers show decreasing coercive fields as the film thickness increased. For the thick fcc film, interestingly, the magnetic easy axis shifts 90° with respect to that of the underlying hcp layers. The result is explained by the shape anisotropy effect due to the formation of quasi-1D columnar islands directed perpendicular to the hcp[0001] direction.

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Uniaxial magnetic anisotropy of Co films on sapphire

Cited by 30 publications

References 22 publications

Magnetic exchange-coupling effects in asymmetric trilayer structures of MBE-grown Co/Cr/Fe

Magnetic exchange-coupling effects in asymmetric trilayer structures of MBE-grown Co/Cr/Fe

Magnetization Dynamics in Co<SUB>2</SUB>MnGe/Al<SUB>2</SUB>O<SUB>3</SUB>/Co Tunnel Junctions Grown on Different Substrates

Magnetic and structural characterizations of HCP permalloy films grown by molecular beam epitaxy

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