Magnetic properties of permalloy multilayers with alternating perpendicular anisotropies

Maícas, M.; Ranchal, R.; Aroca, C.; Sánchez, P.; López, E.

doi:10.1140/epjb/e2008-00163-4

Cited by 11 publications

(14 citation statements)

References 11 publications

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“…The ballistic layer exhibits a magnetic easy axis in the reference direction [ Fig. 6(a)], in agreement with previous papers about other magnetic systems also deposited in oblique incidence [36][37][38].…”

Section: Resultssupporting

confidence: 91%

“…6(a) and 6(b) we present the in-plane hysteresis loops measured at room temperature for the layers analyzed by XAFS. To study the in-plane magnetic behavior, the magnetic field has been applied, forming different angles with respect to a reference direction taken as the intersection between the incidence and the substrate planes [36]. The ballistic layer exhibits a magnetic easy axis in the reference direction [ Fig.…”

Section: Resultsmentioning

confidence: 99%

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Influence of the sputtering flow regime on the structural properties and magnetic behavior of Fe-Ga thin films (Ga ∼ 30 at.%)

2016

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In this paper we analyze the structure of Fe-Ga layers with a Ga content of ∼30 at.% deposited by the sputtering technique under two different regimes. We also studied the correlation between the structure and magnetic behavior of the samples. Keeping the Ar pressure fixed, we modified the flow regime from ballistic to diffusive by increasing the distance between the target and the substrate. X-ray diffraction measurements have shown a lower structural quality when growing in the diffusive flow. We investigated the impact of the growth regime by means of x-ray absorption fine structure (XAFS) measurements and obtained signs of its influence on the local atomic order. Full multiple scattering and finite difference calculations based on XAFS measurements point to a more relevant presence of a disordered A2 phase and of orthorhombic Ga clusters on the Fe-Ga alloy deposited under a diffusive regime; however, in the ballistic sample, a higher presence of D0 3 /B2 phases is evidenced. Structural characteristics, from local to long range, seem to determine the magnetic behavior of the layers. Whereas a clear in-plane magnetic anisotropy is observed in the film deposited under ballistic flow, the diffusive sample is magnetically isotropic. Therefore, our experimental results provide evidence of a correlation between flow regime and structural properties and its impact on the magnetic behavior of a rather unexplored compositional region of Fe-Ga compounds.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Influence of the sputtering flow regime on the structural properties and magnetic behavior of Fe-Ga thin films (Ga ∼ 30 at.%)

2016

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“…First Py layer is deposited with the sample holder in one fixed position and then it is rotated 90 before growing the second Py layer as described in previous works. 6,9 Due to the symmetry the hysteresis loop (Figure 4) is similar in the two perpendicular anisotropy axis of this sample and it can be considered as the addition of two loops, one for the easy axis and another for the hard axis. This agrees with two Py layers magnetically isolated with independent magnetic processes.…”

Section: Resultsmentioning

confidence: 96%

“…Then, this film exhibits a magnetic anisotropy that is induced in the direction of incidence beam, being parallel to the intersection between the incidence and the substrate planes ( Figure 1, inset) as described in previous works. [6][7][8][9][10] Samples with Py thicknesses of 125, 250, and 375 nm were grown in order to study the effect of the layer thickness on magnetic properties. Hysteresis loops for these samples are shown in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

“…5 Properties like permeability or linearity of the hysteresis loops can be controlled by growing Py as a sputtered multilayer with alternating perpendicular anisotropies. 6 However, for thicknesses over 180 nm, sputtered Py films develop perpendicular anisotropy (induced by the columnar morphology of the sputtered films) and these magnetic properties degrade notably. 2 Both coercive and saturating fields are nearly 10 times bigger than those measured for thinner films.…”

Section: Introductionmentioning

confidence: 99%

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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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The role of surface to bulk ratio on the development of magnetic anisotropy in high Ga content Fe100-xGax thin films

Muñoz-Noval

Fin

Salas‐Colera

et al. 2018

Journal of Alloys and Compounds

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In this work we show the development of bulk in-plane magnetic anisotropy in high Gacontent (Ga = 28 at. %) Fe 100-x Ga x thin films as the layer thickness increases. This result is in clear contrast with the generally reported decrease of this anisotropy with the film thickness. We propose the interrelation between the enhancement of the Ga-pair correlations and a collinear distortion of the bcc structure within the sample plane as the origin of the magnetic anisotropy. Our results have been obtained by employing a combination of long and local range structural probe techniques with bulk and surface magnetic characterization techniques. The key point shown in this work is that the inplane structural anisotropy and hence, the magnetic anisotropy, are developed as the layer thickness increases. This fact strongly suggests that the surface to bulk free energy ratio plays a key role in the formation of ordered phases with a distorted bcc cell in Fe 100-x Ga x films with x around 28 at. %. Our work also shows the arising of new phenomena in these high Ga content alloys due to the close correlation between structural and magnetic properties.

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Magnetic properties of permalloy multilayers with alternating perpendicular anisotropies

Cited by 11 publications

References 11 publications

Influence of the sputtering flow regime on the structural properties and magnetic behavior of Fe-Ga thin films (Ga ∼ 30 at.%)

Influence of the sputtering flow regime on the structural properties and magnetic behavior of Fe-Ga thin films (Ga ∼ 30 at.%)

Magnetic properties of sputtered Permalloy/molybdenum multilayers

The role of surface to bulk ratio on the development of magnetic anisotropy in high Ga content Fe100-xGax thin films

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