Magnetic anisotropies and rotational hysteresis in Ni81Fe19/Fe50Mn50 films: A study by torque magnetometry and anisotropic magnetoresistance

Silva, O.E. da; Siqueira, J.V. de; Kern, P.R.; Garcia, W.J.S.; Beck, Fred J.; Rigue, Josué Neroti; Carara, M.

doi:10.1016/j.jmmm.2017.10.043

Cited by 8 publications

(3 citation statements)

References 40 publications

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“…Previously, we reported studies on EB systems through the use of different techniques [magnetization measurements, torque measurements and anisotropic magnetoresistance], in which very good agreement between the very same phenomenological model and proper experimental data was obtained [36][37][38]. We have detailed protocols and indicated the sensitivity with which each technique reveals the different parameters linked to the EB phenomenon, highlighting the origins of asymmetries in the curves measured by different techniques.…”

Section: Introductionmentioning

confidence: 74%

Asymmetric magnetoimpedance in exchange-biased systems

Gazola,

Santos,

de Andrade

et al. 2024

J. Phys.: Condens. Matter

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Magnetic systems with competing anisotropies generally exhibit asymmetry between the maximum amplitudes of the right and left maxima of the magnetoimpedance curve. Small errors in positioning the samples at the experimental setup may also produce such asymmetry. In this work, we present a study on the sources of the asymmetry between magnetoimpedance peaks in systems that present the Exchange Bias phenomenon, by comparing a phenomenological model to experimental data. A set of samples with different repetitions of the NiFe/FeMn exchange-biased bilayer was used in this study. From the frequency evolution of the asymmetry, together with magnetization curves, we were able to identify the sources for the observed magnetoimpedance asymmetry found on our experimental data.

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Section: Introductionmentioning

confidence: 74%

Asymmetric magnetoimpedance in exchange-biased systems

Gazola,

Santos,

de Andrade

et al. 2024

J. Phys.: Condens. Matter

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“…This opens new opportunities for coupling spin dynamics to the cavity optomechanics. It will also be a valuable tool in the study of exchange bias and other interface effects [33].…”

Section: Discussionmentioning

confidence: 99%

Two-axis cavity optomechanical torque characterization of magnetic microstructures

et al. 2019

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Significant new functionality is reported for torsion mechanical tools aimed at full magnetic characterizations of both spin statics and dynamics in micro-and nanostructures. Specifically, two orthogonal torque directions are monitored and the results co-analyzed to separate magnetic moment and magnetic susceptibility contributions to torque, as is desired for characterization of anisotropic three-dimensional structures. The approach is demonstrated through application to shape and microstructural disorder-induced magnetic anisotropies in lithographically patterned permalloy, and will have utility for the determination of important magnetic thin-film and multilayer properties including interface anisotropy and exchange bias. The results reflect remarkable sensitivity of the outof-plane magnetic torque to the nature of small edge domains perpendicular to the applied field direction, and also contain tantalizing indications of direct coupling to spin dynamics at the frequency of the mechanics.

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“…The resist ance value of magnetic film depends on the relative direction of the current I and the mag netization M. The resistance achieves its maximum ( R // ) and minimum ( R ⊥ ) values when the current is parallel and perpen dicular to the magnetization, respectively. Therefore, the AMR effect supplies a direct way to reveal the direction of the mag netization, magnetization reversal, and the magnetic anisot ropy [15][16][17][18]. It has already been applied as a simple method for determining the coercivity of single layer magnetic film and ferromagnetic/antiferromagn etic exchanged bias film [19,20].…”

Section: Introductionmentioning

confidence: 99%

An approach to determine the easy axis of magnetic film by anisotropic magnetoresistance measurements

Tang²,

Liu³

et al. 2020

J. Phys.: Condens. Matter

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A series of Ta/NiCo/Ta films was grown through DCsputtering. During deposition, a constant magnetic field was applied along the substrate in different directions to induce different orientations of the easy axis. Three different magnitudes of external fields were applied in the angledependent anisotropic magnetoresistance (AMR) measurements of the samples. Through an effective analysis, the angledirection extracted via the intersection of three angle dependent AMR curves was confirmed as the easy axis. Compared to the normal methods applied to achieve the easy axis, the results are convincing. This new method provides an effective, convenient and low cost way of studying magnetic materials and devices.

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Magnetic anisotropies and rotational hysteresis in Ni81Fe19/Fe50Mn50 films: A study by torque magnetometry and anisotropic magnetoresistance

Cited by 8 publications

References 40 publications

Asymmetric magnetoimpedance in exchange-biased systems

Asymmetric magnetoimpedance in exchange-biased systems

Two-axis cavity optomechanical torque characterization of magnetic microstructures

An approach to determine the easy axis of magnetic film by anisotropic magnetoresistance measurements

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