Magneto-optical Kerr effect in NiZn ferrite films of variable thickness

Calle, C.; Calle, V. H.; Cuellar, Fabián; Cortés, Armando; Arias, D.; Lopera, W.; Guzmán, Orlando; Mendoza, Gilmar

doi:10.1016/j.physb.2006.05.163

Cited by 8 publications

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“…The H c value reaches a maximum value of 63 Oe in the sample L ∼ 529 nm. This result suggests the existence of mono and multidomain structures associated to a critical grain size [4,12].…”

Section: Methodsmentioning

confidence: 71%

Pinning energy of domain walls in MnZn ferrite films

Calle

Cuellar

Calle

et al. 2007

Phys. Status Solidi (c)

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Mn Zn ferrite films deposited on (100) MgO substrates by rf sputtering technique with different thicknesses ξ in the range of 30-450 nm were studied. AFM images show grain size increase as film thickness increases. Grains with diameters between L ∼ 70 and 700 nm were observed. The mono and multidomain regime in MnZn ferrite films and their effect on the pinning energy of domain walls are observed via Magneto-optical Kerr Effect, MOKE. At ξ ∼ 300 nm, the coercive field, H c , reaches a maximum value of 80 Oe. This result indicates the existence of a multidomain regime associated to a critical grain size, L c . We used the Jiles-Atherton model (JAM) to discuss the experimental hysteresis loops. The k pinning parameter obtained from JAM shows a maximum value of k/µ o = 67 Am 2 for grains with L c ∼ 529 nm. The total energy per unit area E was correlated with k and D. We found a simple phenomenological relationship given by E α kD; where D is the magnetic domain width.

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Section: Methodsmentioning

confidence: 71%