Structure and magnetic properties of Co/V multilayers

Du, Jun; Lu, M.; Tong, Liuniu; Ji, Wu; Zhai, Hongru; Xia, Hui

doi:10.1016/s0304-8853(97)00813-5

Cited by 8 publications

(8 citation statements)

References 8 publications

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“…In such a case, the peaks of the TS would be detected at a magnetic field value equal to the anisotropy field of hcp Co. If we take 36 K 1,hcp = 4.1 ϫ 10 6 ergs/ cm 3 and M s ͑hcp͒ = 1430 emu/ cm 3 we obtain an anisotropy field H 1,hcp ϳ 6000 Oe and the sample could not have been saturated in our experimental setup. On the other hand, the samples with the 100 and 200 Å Co layers could only be saturated along the easy axes, but not along the hard axes.…”

Section: Discussionmentioning

confidence: 93%

“…So each fcc Co island reverses the magnetization at a different H value. If we take 31 the saturation magnetization of Co as M s ͑fcc͒ = M s ͑hcp͒ = 1430 emu/ cm 3 , and suppose that the saturation field H sat equals the anisotropy field H 1 of each Co island ͑H 1 = H sat = 100 Oe͒, we obtain an anisotropy constant for each Co particle of K 1 ϳ 7 ϫ 10 4 ergs/ cm 3 . Reported values 32,33 of the magnetocrystalline anisotropy of fcc Co, K 1fcc , range from −3.0ϫ 10 5 to − 7.0ϫ 10 5 erg/ cm 3 for thicknesses from 100 to 1000 Å.…”

Section: Discussionmentioning

confidence: 99%

“…In the last decade great attention has been paid to the study of V / Co multilayers [1][2][3][4] due to the oscillatory exchange through V layers. These studies clearly indicated that a better understanding of the interface magnetism at the V / Co interface is mandatory to understand the physics of this system.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structural and magnetic properties of V∕Cofcc and Cohcp∕V bilayers grown on MgO(100): A comparative study

Calleja

Huttel

Contreras

et al. 2006

Journal of Applied Physics

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Structural and magnetic properties of planar nanowire arrays of Co grown on oxidized vicinal silicon (111) A detailed study of the structure and magnetic properties of V / Co versus Co/ V bilayers grown on MgO͑001͒ substrates with cubic and hexagonal Co crystal structures is presented. Co is found to adopt fcc structure when grown on MgO͑001͒, while it adopts hcp structure when grown on V͑001͒. The different magnetocrystalline anisotropy associated with each structure gives rise to different magnetic properties for the otherwise equivalent symmetric Co-V bilayers.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

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Structural and magnetic properties of V∕Cofcc and Cohcp∕V bilayers grown on MgO(100): A comparative study

Calleja

Huttel

Contreras

et al. 2006

Journal of Applied Physics

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“…In these systems, a coupling strongly dependent on the atomic structure of the layers and on the sharpness of the V / Co interfaces was also reported. 35 Furthermore, the superconducting properties of these systems and in particular the transition temperature of V / Co multilayers was found to oscillate with Co thickness. 36 Such results clearly demonstrate the importance of the V / Co interface and the V and Co layer thicknesses for phenomena such as oscillatory magnetic coupling, giant magnetoresistance, and superconductivity in systems made of thin V and Co layers.…”

Section: Introductionmentioning

confidence: 97%

Interface effects, magnetic, and magneto-optical properties ofAl∕Co∕V∕MgO(100)structures

Huttel

Clavero²,

Laan

et al. 2008

Phys. Rev. B

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The magnetic and magneto-optical properties of Al/ Co/ V / MgO͑100͒ structures and the influence of the Co/ V interface for different thicknesses of the Co and V layers have been studied experimentally. From the element-specific hysteresis loops obtained by x-ray magnetic circular dichroism ͑XMCD͒ at the Co and V L 3 edges we find that the V layers are magnetically polarized antiparallel to the Co layers and that magnetization reversal occurs at the same magnetic field in both layers. The effect of the V atomic volume and the relative thicknesses of V and Co layers on the magnetic moments of the V and Co atoms are also studied. Contrary to what might be expected, the atomic magnetic moments of the V and Co atoms do not depend on the V atomic volume, however they depend strongly on the thicknesses of the V and Co layers. From the trend in the Co and V atomic magnetic moments as a function of Co and V thicknesses and the absence of any spectroscopic evidence for the formation of a VCo alloy, a long-range spin polarization of the V atoms is proposed. The extracted magneto-optical ͑MO͒ constants of V and Co as a function of photon energy clearly evidence a large amount of polarization in the V films in agreement with the XMCD results, which is indicative of the magnetic coupling between Co and V. The experimental MO results and simulations also show the strong influence of these polarized V layers in the MO properties of the complete system. These results, given the absence of spectroscopic evidence for the formation of a VCo alloy, support a long-range magnetization of the V atoms and a reduction of the Co atomic magnetic moments.

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“…31 A more recent work showed that the coupling could be strongly affected by the structure of the Co/V multilayers and by the sharpness of the V/Co interfaces. 32 This is not surprising since the interface is believed to play an important role in the oscillatory magnetic coupling. In the same way it was recently demonstrated that the transition temperature in V/Co superconducting multilayers oscillates with the Co thickness.…”

Section: Introductionmentioning

confidence: 99%

Induced V and reduced Co magnetic moments at the V/Co interface

et al. 2003

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Using x-ray magnetic circular dichroism ͑XMCD͒ the vanadium and cobalt magnetic moments at the V/Co interface have been extracted for different V and Co thicknesses. We find a large magnetic moment induced on the V that is coupled antiferromagnetic to the Co. For Co both the spin and orbital moments are reduced at the interface. The evolution of the magnetic moment together with the spectral changes in the V L 2,3 XMCD upon V deposition demonstrate the complexity of the V/Co interface as manifested in its physical properties. We show how the hybridization at the interface between the Co and V can lead to a transfer of the exchange interaction, resulting in the modified magnetic moments. The change in the number of Co 3d holes, extracted from x-ray absorption spectroscopy, shows that the charge transfer over the interface is small, indicating that it can not be responsible for the change in the magnetic moments.

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Structure and magnetic properties of Co/V multilayers

Cited by 8 publications

References 8 publications

Structural and magnetic properties of V∕Cofcc and Cohcp∕V bilayers grown on MgO(100): A comparative study

Structural and magnetic properties of V∕Cofcc and Cohcp∕V bilayers grown on MgO(100): A comparative study

Interface effects, magnetic, and magneto-optical properties ofAl∕Co∕V∕MgO(100)structures

Induced V and reduced Co magnetic moments at the V/Co interface

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