Coexistence of the uniaxial anisotropy and the antiferromagnetic coupling in Co/Ir(111) superlattices

Itoh, Hidetake; Yanagihara, Hideto; Suzuki, Katsutoshi; Kita, Eiji

doi:10.1016/s0304-8853(02)01167-8

Cited by 11 publications

(10 citation statements)

References 16 publications

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“…µ 0 H EX (red circles) shows a peak at d Ir ∼0.4 nm. These results are consistent with previous reports in which a strong IEC was observed in Co/Pt multilayers coupled via a thin Ir layer [40,41]. We find a significantly larger µ 0 H EX for the Ir/Co/Pt heterostructures compared to that of the Pt/Co/Ir heterostructures.…”

supporting

confidence: 93%

Giant perpendicular magnetic anisotropy in Ir/Co/Pt multilayers

Lau,

Chi,

Taniguchi

et al. 2019

Preprint

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supporting

confidence: 93%

Giant perpendicular magnetic anisotropy in Ir/Co/Pt multilayers

Lau,

Chi,

Taniguchi

et al. 2019

Preprint

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“…The derived analitical relations between the values of the shift and the strength of antiferromagnetic coupling provide an effective method for a quantitative determination of the interlayer exchange interactions. [2,3,4,5]. Due to the strong competition between antiferromagnetic interlayer exchange and magnetostatic couplings [3,6], nanoscale superlattices with strong perpendicular anisotropy display specific multidomain states and unusual magnetization processes [2,3,5,7], which have no counterpart in other layered systems with perpendicular magnetization [8].…”

mentioning

confidence: 99%

Exchange shift of stripe domains in antiferromagnetically coupled multilayers

Kiselev

Dragunov

Rößler

et al. 2007

Applied Physics Letters

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Antiferromagnetically coupled multilayers with perpendicular anisotropy, as [CoPt]/Ru, Co/Ir, Fe/Au, display ferromagnetic stripe phases as the ground states. It is theoretically shown that the antiferromagnetic interlayer exchange causes a relative shift of domains in adjacent layers. This "exchange shift" is responsible for several recently observed effects: an anomalous broadening of domain walls, the formation of so-called "tiger-tail" patterns, and a "mixed state" of antiferromagnetic and ferromagnetic domains in [CoPt]/Ru multilayers. The derived analitical relations between the values of the shift and the strength of antiferromagnetic coupling provide an effective method for a quantitative determination of the interlayer exchange interactions. [2,3,4,5]. Due to the strong competition between antiferromagnetic interlayer exchange and magnetostatic couplings [3,6], nanoscale superlattices with strong perpendicular anisotropy display specific multidomain states and unusual magnetization processes [2,3,5,7], which have no counterpart in other layered systems with perpendicular magnetization [8].So far, theoretical analysis of magnetization states and processes in antiferromagnetically coupled multilayers with out-of-plane magnetization has been based on micromagnetic models of stripe domains, where the domain walls throughout the whole stack of the ferromagnetic layers sit exactly on top of each other [3,6]. In our letter we show that this assumption is wrong. The antiferromagnetic interlayer coupling causes a lateral shift of the domain walls in the adjacent ferromagnetic layers. We develop a phenomenological theory of these complex stripe states. The analytical evaluation of a basic twolayer model shows that the formation and evolution of such "shifted" multidomain phases should appreciably influence the appearance and the magnetization processes of stripe states in perpendicular, antiferromagnetically coupled multilayers.As a model we consider stripe domains in a superlattice composed of N identical layers of thickness h antiferromagnetically coupled via a spacer of thickness s. The stripe domain phase consists of domains with alternate magnetization M along the z-axis perpendicular to the multilayer plane. The domains are separated by thin domain walls with a finite area energy density σ. The magnetic energy density of the model (Fig. 1 (a) ) can be written as a function of the stripe period D and the shift aThe first term in (1) describes the domain wall energy, w m is the stray field energy, J > 0 is the antiferromagnetic exchange interaction. The upper (lower) sign corresponds to an (anti)parallel arrangement of the magnetization in the adjacent layers. We call these modes ferro and antiferro stripe phases. We introduce a set of reduced geometrical parametersand two characteristic lengthsdescribing the relative energy contributions of the domain walls (l) and the interlayer coupling (δ) in comparison to the stray field energy. Then, the reduced energy w = W/(2πM 2 N ) can be writtenThe stray field ene...

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“…sf 2 is continuous between the points △ and a further tricritical point . For stronger (7). The grey area designates the stability region of the canted phases.…”

Section: B Magnetic Field Along Easy Directionsmentioning

confidence: 99%

“…In particular, much attention has been given to multilayers composed of antiferromagnetically coupled ferromagnetic nanolayers. [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17] Such layered synthetic antiferromagnets can be separated into two classes according to the symmetries ruling their magnetic properties: Superlattices with relatively strong uniaxial anisotropies include low-symmetry multilayers with effective uniaxial magnetic anisotropy in the layer planes, e.g. epitaxial systems deposited on (110), (211) faces of cubic substrates.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic phases and reorientation transitions in antiferromagnetically coupled multilayers

Rößler

Bogdanov

2004

Phys. Rev. B

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In antiferromagnetically coupled superlattices grown on (001) faces of cubic substrates, e.g. based on materials combinations as Co/Cu, Fe/Si, Co/Cr, or Fe/Cr, the magnetic states evolve under competing influence of bilinear and biquadratic exchange interactions, surface-enhanced four-fold in-plane anisotropy, and specific finite-size effects. Using phenomenological (micromagnetic) theory, a comprehensive survey of the magnetic states and reorientation transitions has been carried out for multilayer systems with even number of ferromagnetic sub-layers and magnetizations in the plane. In two-layer systems (N = 2) the phase diagrams in dependence on components of the applied field in the plane include "swallow-tail" type regions of (metastable) multistate co-existence and a number of continuous and discontinuous reorientation transitions induced by radial and transversal components of the applied field. In multilayers (N ≥ 4) noncollinear states are spatially inhomogeneous with magnetization varying across the multilayer stack. For weak four-fold anisotropy the magnetic states under influence of an applied field evolve by a complex continuous reorientation into the saturated state. At higher anisotropy they transform into various inhomogeneous and asymmetric structures. The discontinuous transitions between the magnetic states in these two-layers and multilayers are characterized by broad ranges of multi-phase coexistence of the (metastable) states and give rise to specific transitional domain structures.

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Coexistence of the uniaxial anisotropy and the antiferromagnetic coupling in Co/Ir(111) superlattices

Cited by 11 publications

References 16 publications

Giant perpendicular magnetic anisotropy in Ir/Co/Pt multilayers

Giant perpendicular magnetic anisotropy in Ir/Co/Pt multilayers

Exchange shift of stripe domains in antiferromagnetically coupled multilayers

Magnetic phases and reorientation transitions in antiferromagnetically coupled multilayers

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