Angular dependence of hysteresis shift in oblique deposited ferromagnetic/antiferromagnetic coupled bilayers

Oliveira, Alexandre Barbosa de; Rodrı́guez-Suárez, R. L.; Michea, S.; Vega, H.; Azevedo, A.; Rezende, S. M.; Aliaga, Carolina; Denardin, Juliano C.

doi:10.1063/1.4890457

Cited by 9 publications

(6 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the resonance field H R as a function of the angle φ is determined by fitting the derivative of the absorption spectra. For further details on the experiment and analysis, we recommend [13,23,24].…”

Section: Methodsmentioning

confidence: 99%

Thickness dependence of the magnetic anisotropy and dynamic magnetic response of ferromagnetic NiFe films

Silva

Corrêa

Pace

et al. 2017

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

We investigate the thickness dependence of the magnetic anisotropy and dynamic magnetic response of ferromagnetic NiFe films. We go beyond quasi-static measurements and focus on the dynamic magnetic response by considering three complementary techniques: the ferromagnetic resonance, magnetoimpedance and magnetic permeability measurements. We verify remarkable modifications in the magnetic anisotropy, i.e. the well-known behavior of in-plane uniaxial magnetic anisotropy systems gives place to a complex magnetic behavior as the thickness increases, and splits the films in two groups according to the magnetic properties. We identify magnetoimpedance and magnetic permeability curves with multiple resonance peaks, as well as the evolution of the ferromagnetic resonance absorption spectra, as fingerprints of strong changes of the magnetic properties associated to the vanishing of the in-plane magnetic anisotropy and to the emergence of non-homogeneous magnetization configuration, local anisotropies and out-of-plane anisotropy contribution arisen as a consequence of the non-uniformities of the stress stored in the film as the thickness is increased and/or to the columnar growth of the film. We interpret the experimental results in terms of the structural and morphological properties, quasi-static magnetic behavior, magnetic domain structure and different mechanisms governing the magnetization dynamics at distinct frequency ranges.

show abstract

Section: Methodsmentioning

confidence: 99%

Thickness dependence of the magnetic anisotropy and dynamic magnetic response of ferromagnetic NiFe films

Silva

Corrêa

Pace

et al. 2017

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The equilibrium position of the magnetizations at which the terms in Eq. ( 1) are evaluated was obtained from the energy minimization of the magnetic free energy per unit area, 25 which considers the relevant terms to describe magnetic behavior…”

Section: Modelmentioning

confidence: 99%

Rotatable anisotropy on ferromagnetic/antiferromagnetic bilayer investigated by Brillouin light scattering

Rodrı́guez-Suárez

Oliveira

Estrada

et al. 2018

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

The nature of the rotatable anisotropy in ferromagnetic/antiferromagnetic (FM/AF) NiFe/IrMn bilayers has been investigated using magneto-optical Kerr effect magnetometry, ferromagnetic resonance, and Brillouin Light Scattering (BLS) techniques. The behavior of the magnon frequencies with an external magnetic field applied in the bilayer plane has been measured by BLS. The angular dependence of magnon frequency shows a shift when compared to numerical calculation for different magnetic field intensities. This frequency shift can be associated with the rotatable anisotropy and it depends on the magnetic field intensity. As a result, the rotatable anisotropy field exhibits a non-monotonic dependence on the applied field. The results are interpreted considering the coexistence of parallel and antiparallel coupling at the FM/AF interface.

show abstract

“…As known, obliquely deposited metal films develop columnar microstructures that induce very large uniaxial anisotropy fields as well as large coercivities. 24,25 Before the PMR measurements, the Py film was investigated by means of magnetoresistance (MR) and vibrating sample magnetometer (VSM) techniques. To understand the physical meaning of the PMR signals, we compared them with the magnetization hysteresis measurements obtained with VSM.…”

Section: B Experimental Results and Physical Interpretationmentioning

confidence: 99%

Perturbative measurement of magnetoresistance

Oliveira

Melo

Costa

et al. 2018

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

In this paper, we report the development of a novel technique in which the magnetoresistance of nanostructures is perturbatively measured by transversally modulating the DC magnetic field. It measures the electrical transport counterpart of the transverse magnetic AC-susceptibility. The technique was developed in a conventional four-probe configuration in which a small DC current flows through the sample and a small transverse AC-field perturbates the equilibrium position of the sample magnetization. Lock-in detection, in-phase with the AC-perturbation, is used to measure the voltage signal between the two inner electrodes of the four-probe station. We successfully demonstrated that this signal is proportional to the product of the first derivative of sample resistance with respect to the equilibrium position of the magnetization times the second derivative of the energy with respect to the equilibrium position of the magnetization. These dependences add new features to the technique investigated here that were not captured by the investigations previously reported on the same subject. To show the effective use of the technique, we discuss its application in measuring magnetic properties of thin magnetic films in the non-saturated regime.

show abstract

Angular dependence of hysteresis shift in oblique deposited ferromagnetic/antiferromagnetic coupled bilayers

Cited by 9 publications

References 20 publications

Thickness dependence of the magnetic anisotropy and dynamic magnetic response of ferromagnetic NiFe films

Thickness dependence of the magnetic anisotropy and dynamic magnetic response of ferromagnetic NiFe films

Rotatable anisotropy on ferromagnetic/antiferromagnetic bilayer investigated by Brillouin light scattering

Perturbative measurement of magnetoresistance

Contact Info

Product

Resources

About