Ferromagnetic resonance excitation of two-dimensional wall structures in magnetic stripe domains

Ebels, U.; Buda, L. D.; Ounadjela, K.; Wigen, P. E.

doi:10.1103/physrevb.63.174437

Cited by 62 publications

(54 citation statements)

References 24 publications

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“…These conditions for excitation of the two modes are completely comparable to those of the domain resonance modes, as described in Ref. [6].…”

Section: Article In Pressmentioning

confidence: 82%

“…2a-c for an extended film and two stripes with different domain width. This damped oscillation is kicked off by the additional field h pulse and not continuously forced and excited as in regular ferromagnetic resonance (FMR) experiments, in which a steady rf-field is applied [6,7]. In this sense the effect may be considered as a free oscillation.…”

Section: Introductionmentioning

confidence: 97%

“…As explained in the reviews [6][7][8][9] (cf. also the references therein) the most important modes governing the spin dynamics in patterned structures are: (i) domain-wall boundary oscillations, (ii) the rigid motion of the magnetization within a domain (macro-spin model) and (iii) excitation of an inhomogeneous spin distribution within a domain.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Precessional frequency of ferromagnetic elements: Influence of magnetic domain width

Wolf¹,

Schäfer²,

McCord³

2009

Journal of Magnetism and Magnetic Materials

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“…These conditions for excitation of the two modes are completely comparable to those of the domain resonance modes, as described in Ref. [6].…”

Section: Article In Pressmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Precessional frequency of ferromagnetic elements: Influence of magnetic domain width

Wolf¹,

Schäfer²,

McCord³

2009

Journal of Magnetism and Magnetic Materials

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“…Twodimensional ͑2D͒ periodic micromagnetic simulations were performed in order to extract information about the magnetic domain structure in the ͓Pt/ Co͔-NiFe system at remanence after application of a large in-plane magnetic field. In the micromagnetic model, 8 the ͓Pt/ Co͔ multilayer was considered as a single FM layer having the same characteristics as the multilayer. The material parameters used for the ͓Pt/ Co͔ multilayer were the exchange constant A ex =3 ϫ 10 −7 erg/ cm, the out-of-plane uniaxial magnetocrystalline anisotropy constant K u = 2.195ϫ 10 6 erg/ cm 3 , and the saturation magnetization M s = 388 emu/ cm 3 resulting in a quality factor Q = K u / ͑2M s 2 ͒ = 2.3 comparable to values reported in the literature.…”

Section: Methodsmentioning

confidence: 99%

Magnetic behavior of systems composed of coupled ferromagnetic bilayers with distinct anisotropy directions

et al. 2006

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“…4(b) differ in three important points: the EA loop has (i) a 20% higher coercivity H c , (ii) a 20% higher remanence M r , but (iii) an almost 50% lower critical field H crit compared to the HA loop. For FMR measurements, the influence of different relative orientations of stripe domains and rf magnetic field H rf has been shown to lead to higher (lower) resonance frequencies in case of parallel (perpendicular) alignment as a result of the excitation of optical (acoustic) modes due to out-of-phase (in-phase) precession of the magnetization in adjacent stripe domains 8,10,12,22,23,37 . However, the way the FMR measurements in this work have been performed, stripe domains and rf magnetic field H rf (dc magnetic field H) are always perpendicular (parallel) during the entire hysteresis cycle and independent of the field sweep direction as simulated in Ref.…”

mentioning

confidence: 99%

Tunable ferromagnetic resonance in coupled trilayers with crossed in-plane and perpendicular magnetic anisotropies

Markó

Valdés-Bango

Quirós

et al. 2019

Applied Physics Letters

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A novel approach to tune the ferromagnetic resonance frequency of a soft magnetic Ni 80 Fe 20 (Permalloy = Py) film with in-plane magnetic anisotropy (IMA) based on the controlled coupling to a hard magnetic NdCo x film with perpendicular magnetic anisotropy (PMA) through a non-magnetic Al spacer is studied. Using transverse magneto-optical Kerr effect (TMOKE), alternating gradient magnetometry (AGM) as well as vector network analyzer ferromagnetic resonance (VNA-FMR) spectroscopy, the influence of both Co concentration and Al spacer thickness on the static and dynamic magnetic properties of the coupled IMA/PMA system is investigated. Compared to a single Py film, two striking effects of the coupling between IMA and PMA layers can be observed in their FMR spectra. First, there is a significant increase in the zero-field resonance frequency from 1.3 GHz up to 6.6 GHz, and second, an additional frequency hysteresis occurs at low magnetic fields applied along the hard axis. The maximum frequency difference between the frequency branches for increasing and decreasing magnetic field is as high as 1 GHz, corresponding to a tunability of about 20% at external fields of typically less than ±70 mT. The origin of the observed features in the FMR spectra is discussed by means of magnetization reversal curves.The magnetic properties of thin films and multilayers exhibiting stripe domains have been investigated extensively in both experiment and theory since their discovery more than half a century ago 1 . In recent years, research results on stripe domains have triggered the prospect of employing their unique properties in future microwave, magnonic, and spintronic devices with novel functionalities. The formation of stripe domains is the result of energy minimization as well as the competition between PMA (K ⊥ ) and shape anisotropy ( 1 2 µ 0 M 2 S ), which favor out-of-plane and in-plane magnetization, respectively. The ratio Q = 2K ⊥ /µ 0 M 2 S , known as reduced anisotropy or quality factor 2 , is commonly used to describe the extent of stripe domains. For moderate (Q < 1) to weak (Q 1) PMA, the magnetization tends to lie in the plane, but above a critical film thickness d cr , a ground state with stripe domains emerges. The latter is characterized by a perpendicular magnetization component alternating between up and down within a period λ . The critical thickness d cr is typically in the range of 20 -40 nm for moderate Q value materials such as amorphous NdCo alloys 3,4 , whereas for materials like Py with small values of Q, generally larger values of d cr = 170 -300 nm are found 5-8 . Intimately linked to the presence of stripe domains is the occurrence of a pseudo-uniaxial or rotatable anisotropy 9,10 , which is the result of the in-plane magnetization being aligned along the stripe direction. The latter, however, is not fixed as it can be reoriented by applya) Electronic

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Ferromagnetic resonance excitation of two-dimensional wall structures in magnetic stripe domains

Cited by 62 publications

References 24 publications

Precessional frequency of ferromagnetic elements: Influence of magnetic domain width

Precessional frequency of ferromagnetic elements: Influence of magnetic domain width

Magnetic behavior of systems composed of coupled ferromagnetic bilayers with distinct anisotropy directions

Tunable ferromagnetic resonance in coupled trilayers with crossed in-plane and perpendicular magnetic anisotropies

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