Thickness and grain-size dependence of the coercivity in permalloy thin films

Akhter, M.A.; Mapps, D.J.; Tan, Yang; Petford‐Long, Amanda K.; Doole, R. C.

doi:10.1063/1.365100

Cited by 54 publications

(27 citation statements)

References 4 publications

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“…For this purpose, the NaCl substrates were dissolved away in water and then the films were caught on microscope copper grids. Our experiments [18] and those reported in the literature by other authors [19][20][21] show that the film structure is practically not affected by the specimen preparation method for TEM investigations. Experimental conditions concerning observation of the magnetic microstructure were optimized to improve the magnetic contrast in the images [16].…”

Section: Methodssupporting

confidence: 65%

Study of thermally evaporated thin permalloy films by the Fresnel mode of TEM and AFM

Szmaja

Balcerski

Kozlowski

et al. 2012

Journal of Alloys and Compounds

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Section: Methodssupporting

confidence: 65%

Study of thermally evaporated thin permalloy films by the Fresnel mode of TEM and AFM

Szmaja

Balcerski

Kozlowski

et al. 2012

Journal of Alloys and Compounds

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“…For this purpose, the NaCl substrates were dissolved away in water and then the films were caught on microscope copper grids. Our investigations [22,23] and those reported by other authors [24,25] show that the film structure is practically not affected by the specimen preparation method for TEM observation. The magnetic microstructure was also imaged with MFM using an NTMDT NTEGRA Prima instrument operated in the dynamic mode.…”

Section: Methodssupporting

confidence: 61%

Investigation of thermally evaporated nanocrystalline thin cobalt films

et al. 2017

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structures are of large importance. From the practical point of view, they are very significant for tailoring of the specimens with the required properties. In particular, they allow to develop high-density magnetic and magneto-optic recording media, modern recording heads, high-performance permanent magnets, magnetic sensors, and transformer steel sheets [1,2]. The knowledge of the magnetic domain behavior in relation to the morphological structure of the specimens is also important for theoretical modeling of magnetic properties [1,2].Thin magnetic films attract large attention from the fundamental as well as technological point of view. On the fundamental side, they exhibit different magnetic properties, such as magnetic anisotropy [3], magnetic microstructure [4], coercivity [5], and magnetoresistance [6], depending on their thickness, composition, crystalline structure, and preparation conditions. From the technological point of view, thin magnetic films have a number of applications; for example, they are used in magnetic information storage media, magneto-optic recording media, magnetic devices, and sensors [1,2].In particular, cobalt thin films have been the subject of wide and intense study in recent years. They can be prepared by various techniques, for example by sputtering, thermal evaporation, electron beam evaporation, molecular beam epitaxy, pulsed laser deposition, electrodeposition, and chemical vapor deposition [7][8][9]. The obtained films are usually nanocrystalline in nature and possess specific, improved mechanical, physical, magnetic, and chemical properties in comparison with conventional microcrystalline counterparts. Depending on the film thickness as well as the preparation method and conditions used, cobalt thin films exhibit a wide range of morphological and magnetic properties, and especially various magnetic domain structures with inplane and outofplane magnetization [10][11][12][13]. AbstractIn this paper, a study has been made of nanocrystalline thin cobalt films with thicknesses in the range from 10 to 60 nm. The films were thermally evaporated at incidence angle of 0° in a vacuum of about 10 − 5 mbar. The morphological structure of the films consists of nanocrystalline grains regular in shape and densely packed. As the film thickness is increased from 10 to 60 nm, the average grain size increases from 22.0 to 28.9 nm. The films crystallize mainly in the hexagonal close-packed phase of cobalt. The magnetic structure is composed of domains. In films with thicknesses in the range from 10 to 40 nm, the domains are magnetized in the plane of the film, while films with thicknesses of 50 and 60 nm possess both inplane and perpendicular magnetization components. The domains with inplane magnetization are irregular in shape and typically from a few to 10 mm in size, whereas the domains with perpendicular magnetization form a fine maze stripe pattern of the order of 100 nm in width.

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“…This result is in contrast with the effect of thickness in Py single layers where other authors have found a decrease in the coercivity with the decrease of the layer thickness in the range between 30 and 7 nm. 12 In the case of our multilayers, it is necessary to consider two new effects when comparing with Py single layers: the magnetostatic coupling between domain walls in different layers and the increase in the number of boundary surfaces. Nèel walls may induce quasi-domainwalls in the contiguous coupled layer due to the magnetostatic coupling, and so, domain wall dynamics is affected by them.…”

Section: Resultsmentioning

confidence: 99%

Magnetic properties of sputtered Permalloy/molybdenum multilayers

Romera¹,

Ranchal²,

Ciudad³

et al. 2011

Journal of Applied Physics

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In this work, we report the magnetic properties of sputtered Permalloy (Py: Ni 80 Fe 20 )/molybdenum (Mo) multilayer thin films. We show that it is possible to maintain a low coercivity and a high permeability in thick sputtered Py films when reducing the out-of-plane component of the anisotropy by inserting thin film spacers of a non-magnetic material like Mo. For these kind of multilayers, we have found coercivities which are close to those for single layer films with no out-of-plane anisotropy. The coercivity is also dependent on the number of layers exhibiting a minimum value when each single Py layer has a thickness close to the transition thickness between Neel and Bloch domain walls.

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Thickness and grain-size dependence of the coercivity in permalloy thin films

Cited by 54 publications

References 4 publications

Study of thermally evaporated thin permalloy films by the Fresnel mode of TEM and AFM

Study of thermally evaporated thin permalloy films by the Fresnel mode of TEM and AFM

Investigation of thermally evaporated nanocrystalline thin cobalt films

Magnetic properties of sputtered Permalloy/molybdenum multilayers

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