Experimental exploration of dynamic phase transitions and associated metamagnetic fluctuations for materials with different Curie temperatures

Ramírez, J. M. Marín; Oblak, E.; Riego, Patricia; Campillo, G.; Osorio, J.; Arnache, O.; Berger, Andreas

doi:10.1103/physreve.102.022804

Cited by 23 publications

(12 citation statements)

References 62 publications

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“…Overall, presence of sidebands in the kinetic Ising model has been theoretically confirmed by a variety of methods including the MFT [94], EFT [98] and MC simulations based on Metropolis and Glauber dynamics [37] thereby supporting the experimental observations [94]. DPT and metamagnetic anomalies have also been experimentally realized at room temperature for epitaxial Co 1−x Ru x films with uniaxial in-plane anisotropy for Ru content ranging between 0.0 ⩽ x ⩽ 0.26 [99] for which T c decreases as the Ru concentration increases. As shown in figure 7, although the qualitative evolution of the sidebands are not sensitive to varying x values, quantitative behavior of metamagnetic anomalies of Co 1−x Ru x films are found to be strongly dependent on the T/T c ratio, since the side band peaks become enhanced with increasing x.…”

Section: Metamagnetic Anomaliessupporting

confidence: 61%

Dynamic phase transition in classical Ising models

Yüksel¹,

Vatansever²

2021

J. Phys. D: Appl. Phys.

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When a ferromagnetic system is driven by an oscillating magnetic field, the system shows various intriguing magnetic properties. The two most common features are dynamic phase transition and dynamic hysteresis resulting from the competition between the period of the external field and the metastable lifetime of the system. In this article, we mainly review the similarities and dissimilarities between ferromagnetic systems in thermal equilibrium and those exposed to a driving time-dependent magnetic field. Extensive studies performed over two decades have shown that dynamic and thermodynamic phase transitions correspond to the same universality class and have similar phase diagrams, among other similarities. Remarkably, recent experimental studies have revealed that both fluctuations in dynamic order parameter and susceptibility can demonstrate anomalously sharp sidebands, which are known as metamagnetic anomalies, in the dynamically paramagnetic phase close to the critical point. This behavior is one of the most interesting behaviors observed in the magnetic systems driven by a time-dependent field which does not have an analog in the corresponding equilibrium counterparts. We discuss the general picture regarding the effects of the applied field components on the metamagnetic anomalies. As a main conclusion, we remark that a comprehensive literature overview reveals that the similarities between conventional thermodynamic phase transitions and corresponding dynamic counterpart are only limited to the vicinity of critical period regime with zero bias field, and they should be treated very carefully in the presence of surfaces. Finally, some of the main questions waiting to be answered and potential future research directions are underlined.

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Section: Metamagnetic Anomaliessupporting

confidence: 61%

Dynamic phase transition in classical Ising models

Yüksel¹,

Vatansever²

2021

J. Phys. D: Appl. Phys.

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“…To achieve good epitaxial quality and the particular crystal orientation that contains the c-axis within the surface plane and thus induces an in-plane easy magnetization axis, a specific growth sequence has been used, that is described in detail in prior work [44,45]. Specifically, the sequence of sample S1 includes a hydrofluoric acid etched Si (110) substrate, 35 nm of Ag (110), 10 nm of Cr (211), 20 nm of Co 74 Ru 26 (1010), and a 10 nm SiO 2 overcoat, which was deposited to avoid surface oxidation and contaminations of the magnetic CoRu layer [46]. The second sample (S2) consists of a 50 nm thick yttrium iron garnet (YIG) layer deposited on a thermally oxidized Si substrate via radiofrequency magnetron sputtering and post-annealed in atmosphere at 750 • C for 1 h. On top of this layer, a 0.3 nm Ni 80 Fe 20 layer and a 1 nm Pt overcoat have also been sputtered deposited in succession to protect the sample [47].…”

Section: Samplesmentioning

confidence: 99%

Sensitivity and reproducibility of transverse magneto-optical Kerr effect (T-MOKE) ellipsometry

Valderrama¹,

Quintana²,

Martínez-de-Guerenu³

et al. 2022

J. Phys. D: Appl. Phys.

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We report a comprehensive experimental study to analyze the limiting factors and physical mechanisms that determine the achievable performance of Transverse Magneto-Optical Kerr Effect (T-MOKE) ellipsometry. Specifically, we explore different approaches to achieve high sensitivity and reduced acquisition times. The best sensitivity is observed for an incident light polarization with balanced s-p components. We also verify experimentally that the method’s theoretical description is accurately describing data for any s-p combination of the incoming light. Furthermore, two alternative measurement strategies are explored by using different measurement sequences for the polarization sensitive optics, which both achieve a very comparable, high quality of results. Signal-to-noise ratios and systematic deviations are measured and analyzed based on a large number of nominally identical measurement repeats, both for entire signal sequences as well as for individual Fourier components of the magneto-optical signal generated by a sinusoidal magnetic field sequence. Hereby, we observe that while higher order Fourier components have a significantly reduced signal amplitude and correspondingly exhibit reduced signal-to-noise and repeatability performance, signal-to-noise ratios always exceed values of 100 even for the lowest signal Fourier component and the lowest signal sample that we investigated, illustrating the extremely precise nature of T-MOKE ellipsometry.

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“…Recently, the experimental observations of Refs. 16,36 have been supported by some theoretical studies [37][38][39][40] . In the following, we present our simulation results for the present model.…”

Section: Metamagnetic Anomaliesmentioning

confidence: 77%

Monte Carlo simulation of equilibrium and dynamic phase transition properties of an Ising bilayer

Yüksel

2018

Eur. Phys. J. B

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Magnetic properties of an Ising bilayer system defined on a honeycomb lattice with non-magnetic interlayers which interact via an indirect exchange coupling have been investigated by Monte Carlo simulation technique. Equilibrium properties of the system exhibit ferrimagnetism with P -, N-and Q-type behaviors. Compensation phenomenon suddenly disappears with decreasing strength of indirect ferrimagnetic interlayer exchange coupling. Qualitative properties are in a good agreement with those obtained by effective field theory. In order to investigate the stochastic dynamics of kinetic Ising bilayer, we have introduced two different types of dynamic magnetic fields, namely a square wave, and a sinusoidally oscillating magnetic field form. For both field types, compensation point and critical temperature decrease with increasing amplitude and field period. Dynamic ferromagnetic region in the presence of square wave magnetic field is narrower than that obtained for sinusoidally oscillating magnetic field when the amplitude and the field period are the same for each type of dynamic magnetic fields.

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Experimental exploration of dynamic phase transitions and associated metamagnetic fluctuations for materials with different Curie temperatures

Cited by 23 publications

References 62 publications

Dynamic phase transition in classical Ising models

Dynamic phase transition in classical Ising models

Sensitivity and reproducibility of transverse magneto-optical Kerr effect (T-MOKE) ellipsometry

Monte Carlo simulation of equilibrium and dynamic phase transition properties of an Ising bilayer

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