Size and shape dependence study of magnetization reversal in magnetic antidot lattice arrays

Mallick, Sougata; Bedanta, Subhankar

doi:10.1016/j.jmmm.2015.01.049

Cited by 24 publications

(24 citation statements)

References 30 publications

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“…Mainly, antidot lattices are investigated in magnetic thin films with in-plane anisotropy where the strong influence of the nanostructures due to emergent demagnetization fields at the hole edges is obvious [12]. This is widely used to tune the magnetic anisotropy [13][14][15] and coercivity [16][17][18] of these thin films, and the microscopic origin is well established in literature [15,[19][20][21][22][23][24]. To gain an understanding of the processes involved in the magnetization reversal a multitude of approaches have been combined, namely, micromagnetic simulations [15,19,20], magneto-optical Kerr effect (MOKE) measurements [23,24], photo electron emission microscopy (PEEM) with x-ray circular dichroism (XMCD) contrast [21], scanning x-ray microscopy (SXM) with XMCD contrast [24], and first-order reversal curve (FORC) measurements [19,22,24].…”

Section: Introductionmentioning

confidence: 99%

Geometric control of the magnetization reversal in antidot lattices with perpendicular magnetic anisotropy

et al. 2016

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While the magnetic properties of nanoscaled antidot lattices in in-plane magnetized materials have widely been investigated, much less is known about the microscopic effect of hexagonal antidot lattice patterning on materials with perpendicular magnetic anisotropy. By using a combination of first-order reversal curve measurements, magnetic x-ray microscopy, and micromagnetic simulations we elucidate the microscopic origins of the switching field distributions that arise from the introduction of antidot lattices into out-of-plane magnetized GdFe thin films. Depending on the geometric parameters of the antidot lattice we find two regimes with different magnetization reversal processes. For small antidots, the reversal process is dominated by the exchange interaction and domain wall pinning at the antidots drives up the coercivity of the system. On the other hand, for large antidots the dipolar interaction is dominating which leads to fragmentation of the system into very small domains that can be envisaged as a basis for a bit patterned media.

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Section: Introductionmentioning

confidence: 99%

Geometric control of the magnetization reversal in antidot lattices with perpendicular magnetic anisotropy

et al. 2016

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“…Micromagnetic simulation found widespread use and indicated complex intermediate magnetization patterns during magnetization reversal [18][19][20][21]. On the other hand, microscopic investigations have been conducted by others using magneto-optical Kerr effect (MOKE) measurements [22] and photoelectron emission microscopy (PEEM) [16,23] using x-ray magnetic circular dichroism (XMCD) as contrast mechanism. These studies also indicate the complex intermediate magnetization states, but are limited in spatial resolution [22] or the imperfect lattice order in self-organized antidot lattices [23].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, microscopic investigations have been conducted by others using magneto-optical Kerr effect (MOKE) measurements [22] and photoelectron emission microscopy (PEEM) [16,23] using x-ray magnetic circular dichroism (XMCD) as contrast mechanism. These studies also indicate the complex intermediate magnetization states, but are limited in spatial resolution [22] or the imperfect lattice order in self-organized antidot lattices [23]. Another approach to elucidating the reversal mechanisms are first-order reversal curves (FORC) [18,21,24].…”

Section: Introductionmentioning

confidence: 99%

Combined first-order reversal curve and x-ray microscopy investigation of magnetization reversal mechanisms in hexagonal antidot lattices

et al. 2016

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The magnetization reversal in nanoscaled antidot lattices is widely investigated to understand the tunability of the magnetic anisotropy and the coercive field through nanostructuring of thin films. By investigating highly ordered focused ion beam milled antidot lattices with a combination of first-order reversal curves and magnetic x-ray microscopy, we fully elucidate the magnetization reversal along the distinct orientations of a hexagonal antidot lattice. This combination proves especially powerful as all partial steps of this complex magnetization reversal can be identified and subsequently imaged. Through this approach we discovered several additional steps that were neglected in previous studies. Furthermore, by imaging the microscopic magnetization state during each reversal step, we were able to link the coercive and interaction fields determined by the first-order reversal curve method to true microscopic magnetization configurations and determine their origin.

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“…The antidots shape-dependent demagnetizing energy plays an important role. Bedanta and Mallick have certified the effect of some kinds of antidot on domains by experiment which is related to the effective anisotropy field [18].…”

Section: Resultsmentioning

confidence: 99%

Ferromagnetic Resonance Controlled by Micro-regions in Fe-Co Based Thin Film

Luo¹,

Zhou²,

Wang³

et al. 2016

Proceedings of the 2016 4th International Conference on Machinery, Materials and Information Technology Applications

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FeCoBSi amorphous thin films containing circular antidots are fabricated on the silicon substrate by photolithography, DC magnetron sputtering and lift-off patterning. The films are divided into several micro-regions by antidots which have different demagnetizing field. The magnetic properties of these thin films are studied by measurement of the dynamic magnetic spectrum and hysteresis loop. The demagnetizing field in micro-regions deteriorates macroscopic uniaxial magnetic anisotropy (UMA). Diverse resonance peaks are found for various antidots. The dipolar coupling among micro-regions and the natural resonance independent part of micro-regions determine the dynamic magnetic spectrum together. The mechanisms of ferromagnetic resonance are proposed to be related to the special domain structure caused by the demagnetizing field in corresponding micro-regions. In order to study the configuration of magnetic moments in micro-regions, the object oriented micromagnetic framework (OOMMF) is used to simulate the dynamic magnetization process.

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Size and shape dependence study of magnetization reversal in magnetic antidot lattice arrays

Cited by 24 publications

References 30 publications

Geometric control of the magnetization reversal in antidot lattices with perpendicular magnetic anisotropy

Geometric control of the magnetization reversal in antidot lattices with perpendicular magnetic anisotropy

Combined first-order reversal curve and x-ray microscopy investigation of magnetization reversal mechanisms in hexagonal antidot lattices

Ferromagnetic Resonance Controlled by Micro-regions in Fe-Co Based Thin Film

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