Magnetization reversal in sputtered Co-Cr films

Barbero, C. J.; Bottoni, G.; Buttafava, P.; Candolfo, D.; Cecchetti, A.; Masoli, F.; Piano, M. Del; Salustri, C.

doi:10.1109/tmag.1982.1062151

Cited by 26 publications

(2 citation statements)

References 11 publications

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“…There are also other works reporting the angular dependence of coercivity in different kinds of magnetic thin films and nanostructures . Magnetization reversal of magnetic media has generally been studied by measuring the angular variation of hysteresis loss, reversal coercivity, remanence squareness, and coercivity . Out of these magnetization parameters, only coercivity is independent of demagnetization and hence is easier to probe in order to study the reversal mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Evolution of coercivity and its angular dependence in CoFe nanostructures subjected to field cooling

Rajan

Ramaswamy

Chandrasekharan

et al. 2013

Surf. Interface Anal.

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Evolution of coercivity and its angular dependence in CoFe nanostructures subjected to field cooling has been investigated in this work. Spherical CoFe grains with an average diameter of 30 nm were grown on a silicon substrate using electron beam evaporation. Further, the as-deposited sample was subjected to field cooling. The morphology and topography of the sample before and after field cooling were characterized by atomic force microscopy and SEM. Magnetic force microscopy indicated that there is a good uniformity of magnetization throughout the sample after field cooling. Vibrating sample magnetometer measurements indicate that the coercivity in CoFe nanostructures is dependent on shape of the nanostructures.

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Section: Introductionmentioning

confidence: 99%

Evolution of coercivity and its angular dependence in CoFe nanostructures subjected to field cooling

Rajan

Ramaswamy

Chandrasekharan

et al. 2013

Surf. Interface Anal.

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“…Angle dependent coercivity and angular dependence of the (VSM) hysteresis loss [3], angle dependent nucleation field [4], Switching field distributions, time dependent measurements and rotational hysteresis torque measurements [5] are well known macroscopic tools to study reversal behaviour. The rotational hysteresis energy loss gives information about the reversal mode and thus recording behaviour [6] and is also related to recording noise [7]. For Fe-alumite it was found that the magnetization reversal mechanism is curling when the applied field lies along the film normal, mainly on the basis of the dependence of the coercive field on the particle diameter [3,8].…”

Section: Introductionmentioning

confidence: 99%

Rotational Hysteresis Measurements on Alumite Perpendicular Media

et al. 1991

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Rotational hysteresis energy loss measurements have been performed to support the analysis of the magnetization processes of Fe-and Co-alumite perpendicular recording media. Two measurement techniques gave comparable results within error limits. The rotational hysteresis integral is severely lowered by the demagnetizing field. Normalizing the integral with the remanent magnetization instead of the saturation magnetization gives for Fe-alumite values indicating the curling mode, which was also proved by other measurement techniques. The half width value ~(1/H)50 is introduced in the rotational loss graph. This value is an estimate for the dispersion of anisotropy axes and in our case it is proportional to the diameter of the Fe-needles. The in-plane loss is very Iow for the Fe-alumite samples, whereas it is high for the Co-alumite. In the well aligned Fealumite, rotation around the easy-axis does not give rise to an energy loss because no anisotropy is present in the rotation plane to cause irreversible magnetization jumps. The crystal anisotropy of fcc-Fe is small compared to the shape anisotropy of the particles. The high in-plane loss measured for Co-alumite is thought to originate from the dispersion of hcp-axes in the Co-needles.

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Reversal Mechanism in Perpendicular Media with Columnar Microstructure

Wielinga¹,

Lodder

1986

phys. stat. sol. (a)

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A contribution is given to the discussion concerning the nature of the magnetization reversa process in sputtered CoCr recording media with columnar morphology. The paper is restricted to the additional effects on the total perpendicular anisotropy by studying the columnar shape anisotropy and the properties of the perpendicular hysteresis loop (shearing and coercivity). On the basis of experiments and calculated results the conclusion is made that the columnar shape anisotropy has no significant influence and a final remark is that a strict particle model cannot account for the magnetic properties of CoCr layers and that a domain wall model offers a better alternative.

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Magnetization reversal in sputtered Co-Cr films

Cited by 26 publications

References 11 publications

Evolution of coercivity and its angular dependence in CoFe nanostructures subjected to field cooling

Evolution of coercivity and its angular dependence in CoFe nanostructures subjected to field cooling

Rotational Hysteresis Measurements on Alumite Perpendicular Media

Reversal Mechanism in Perpendicular Media with Columnar Microstructure

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