Micromagnetic simulation of domain structure in thin permalloy films with in-plane and perpendicular anisotropy

Solovev, P.N.; Izotov, A. V.; Belyaev, B. A.; Boev, Nikita M.

doi:10.1016/j.physb.2020.412699

Cited by 11 publications

(11 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Then the experimentally observed L c value of 200 nm can be obtained according to expression (2) at A = 5 × 10 −7 erg/cm. The obtained A value was in good agreement with the data reported by the other research for FeNi [ 28 , 29 , 30 ]. Thus, the observed values of L c and K p were in a good agreement with each other.…”

Section: Resultssupporting

confidence: 91%

Structural and Magnetic Properties of FeNi Films and FeNi-Based Trilayers with Out-of-Plane Magnetization Component

Svalov

Gorkovenko

Larrañaga

et al. 2022

Sensors

View full text Add to dashboard Cite

FeNi films of different thickness and FeNi/(Fe, Co)/FeNi trilayers were prepared by magnetron sputtering deposition onto glass substrates. The permalloy films had a columnar microstructure. The detailed analysis of the magnetic properties based on the magnetic and magneto-optical measurements showed that at thicknesses exceeding a certain critical thickness, hysteresis loops acquire a specific shape and the coercive force of the films increase sharply. The possibility of the estimation of the perpendicular magnetic anisotropy constant using the Murayama equation for the thickness dependence of saturation field was demonstrated. The results of studies of the structural and magnetic properties of FeNi films laminated by Fe and Co spacers with different thickness are presented.

show abstract

Section: Resultssupporting

confidence: 91%

Structural and Magnetic Properties of FeNi Films and FeNi-Based Trilayers with Out-of-Plane Magnetization Component

Svalov

Gorkovenko

Larrañaga

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

“…This is indeed what we observed when we measured hysteresis loops for this sample (figure 7(a)). These magnetization curves have an appearance characteristic of films with stripe domains, as they consist of two distinct parts corresponding to the abrupt reorientation of magnetic moments in domains and consequent gradual alignment along the applied field [36]. It is noticeable that loops measured along the x-axis (φ H = 0 • ) and y-axis (φ H = 90 • ) are almost identical and have the same coercivity of 8 Oe, indicating the seeming absence of uniaxial anisotropy.…”

Section: Resultsmentioning

confidence: 97%

“…There are two possible explanations for the existence of the additional peak. On the one hand, this peak is excited in fields that are smaller than the saturation field, in which case a weak stripe domain structure can be formed in the film [36]. Therefore, the observed additional absorption might originate from the precession of magnetic moments in domain walls where the effective internal field is increased [37].…”

Section: Resultsmentioning

confidence: 98%

Magnetic anisotropy and ferromagnetic resonance in inhomogeneous demagnetizing fields near edges of thin magnetic films

Solovev,

Belyaev,

Boev

et al. 2024

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Using local ferromagnetic resonance spectroscopy, we have studied the magnetic properties near edges of thin tangentially magnetized permalloy films, in which a well-defined uniaxial magnetic anisotropy was induced perpendicular to one of the edges. In the experiment, two samples with thicknesses of 90 and 300 nm and with slightly different compositions were examined. To explain the magnetization dynamics near edges, we propose a simple yet effective model of a film in the form of a rectangular prism, which yields the modified Kittel formula for the resonance frequency. In this formula, the locally averaged distance-dependent demagnetizing field that emerges near the edges is included as an additional uniaxial anisotropy term. The measurements reveal that at a certain distance from the edge, the resulting (apparent) anisotropy, determined from the angular dependencies of the resonance field, almost vanishes. Moreover, its easy axis reorients to become parallel to the edge. The model predictions agree well with these results, proving that the main resonance mode behavior near the film edges can be accurately described by introducing additional effective uniaxial anisotropy, provided the measuring area is relatively large. However, for the thick (300 nm) sample, additional precession modes are also observed. These modes distort the angular dependence of the main mode, thus demonstrating the limitations of the model.

show abstract

“…We consider the model of a thin film with magnetic parameters corresponding to that of the typical permalloy Ni 80 Fe 20 film 29 —the saturation magnetization = 1000 emu/cm 3 , the exchange constant erg/cm, and the in-plane uniaxial anisotropy erg/cm 3 . The formation of stripe domains in NiFe films, in general, is caused by competing exchange interaction energy, perpendicular magnetic anisotropy energy, and demagnetization energy.…”

Section: Methodsmentioning

confidence: 99%

The origin of magnetization-caused increment in water oxidation

Ren

Gong

et al. 2023

Nat Commun

View full text Add to dashboard Cite

Magnetization promoted activity of magnetic catalysts towards the oxygen evolution reaction (OER) has attracted great attention, but remains a puzzle where the increment comes from. Magnetization of a ferromagnetic material only changes its magnetic domain structure. It does not directly change the spin orientation of unpaired electrons in the material. The confusion is that each magnetic domain is a small magnet and theoretically the spin-polarization promoted OER already occurs on these magnetic domains, and thus the enhancement should have been achieved without magnetization. Here, we demonstrate that the enhancement comes from the disappeared domain wall upon magnetization. Magnetization leads to the evolution of the magnetic domain structure, from a multi-domain one to a single domain one, in which the domain wall disappears. The surface occupied by the domain wall is reformatted into one by a single domain, on which the OER follows the spin-facilitated pathways and thus the overall increment on the electrode occurs. This study fills the missing gap for understanding the spin-polarized OER and it further explains the type of ferromagnetic catalysts which can give increment by magnetization.

show abstract

Micromagnetic simulation of domain structure in thin permalloy films with in-plane and perpendicular anisotropy

Cited by 11 publications

References 28 publications

Structural and Magnetic Properties of FeNi Films and FeNi-Based Trilayers with Out-of-Plane Magnetization Component

Structural and Magnetic Properties of FeNi Films and FeNi-Based Trilayers with Out-of-Plane Magnetization Component

Magnetic anisotropy and ferromagnetic resonance in inhomogeneous demagnetizing fields near edges of thin magnetic films

The origin of magnetization-caused increment in water oxidation

Contact Info

Product

Resources

About