Experimental exploration of the vector nature of the dynamic order parameter near dynamic magnetic phase transitions

Quintana, Mikel; Oblak, E.; Ramírez, J. M. Marín; Berger, Andreas

doi:10.1103/physrevb.102.094436

Cited by 11 publications

(6 citation statements)

References 57 publications

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“…Before concluding this subsection, we note that the vector nature of Q and the corresponding dynamic response functions σ Q and χ Q have been clarified for epitaxial Co and CoRu thin films in the vicinity of DPT [100]. Due to the associated inplane uniaxial anisotropy, these materials mimic the behavior of an anisotropic Heisenberg model in the absence of magnetostatic interactions.…”

Section: Metamagnetic Anomaliesmentioning

confidence: 99%

“…As a conclusion, the authors deduced that DPT properties close to the critical region and the existence of metamagnetic anomalies are not significantly affected by different orientations of the easy axis with respect to the field direction. At this point, it is worth to underline that a comparison of the experimental results presented in [100] with theoretical studies based on the anisotropic Heisenberg model needs particular attention, and remains as an open problem.…”

Section: Metamagnetic Anomaliesmentioning

confidence: 99%

“…• Experimental exploration of the vector nature of the dynamic order parameter near dynamic magnetic phase transitions has been recently realized for Co and CoRu films [100]. However, despite the theoretical studies devoted for clarifying DPT properties of many systems in the context of the Heisenberg model [38,41,42,60], as far as we know there is no work addressing the influence of a bias field on the system's dynamic behavior.…”

Section: Conclusion and Future Challengesmentioning

confidence: 99%

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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 Anomaliesmentioning

confidence: 99%

Section: Metamagnetic Anomaliesmentioning

confidence: 99%

Section: Conclusion and Future Challengesmentioning

confidence: 99%

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Dynamic phase transition in classical Ising models

Yüksel¹,

Vatansever²

2021

J. Phys. D: Appl. Phys.

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“…Upon appropriately aligning the orientation of QWP and P 2 , extinction of this reflected light can be achieved at a particular setting of the element angles θ 2 and Φ 2 . In the vicinity of this extinction point, which is characterized by element orientations θ ext 2 and Φ ext 2 , the set-up is now extremely sensitive to detecting small magneto-optical signals that are caused by the change of p-polarization reflectivity associated with T-MOKE [37][38][39]. Furthermore, the interplay in between the above mentioned optical ellipticity and magneto-optical induced effects enables a complete determination of the reflection matrix, including the optical Fresnel coefficients, if one combines a series of measurements for different (θ 2 , Φ 2 ) settings [34].…”

Section: Experimental Approachmentioning

confidence: 99%

Insertion layer magnetism detection and analysis using transverse magneto-optical Kerr effect (T-MOKE) ellipsometry

Valderrama¹,

Quintana²,

Martínez-de-Guerenu³

et al. 2021

J. Phys. D: Appl. Phys.

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This experimental study demonstrates that with transverse magneto-optical Kerr effect (T-MOKE) ellipsometry, it is possible to determine the magneto-optical and magnetic properties of insertion layers, even if they are superimposed onto much larger magnetic signals from the surrounding structure. Hereby, it turns out to be especially valuable that with T-MOKE ellipsometry one has full and precise quantitative access to the complex value of the magneto-optical reflection matrix component β, because small magneto-optical insertion layer signals do not necessarily increase the absolute size of β, but can lead to observable phase changes of this complex quantity instead. We demonstrate the ability of T-MOKE ellipsometry to precisely detect such small effects and hereby allow for an accurate determination of the alloy concentration dependent onset of ferromagnetism in ultrathin Co x Ru 1−x insertion layers, that are embedded into a much thicker ferromagnetic structure. In addition, a detailed and quantitative signal analysis allowed us to demonstrate that the Co x Ru 1−x insertion layers in our samples exhibit a magnetization reversal behavior that is independent of the adjacent Y 3 Fe 5 O 12 layers, clearly indicating that both magnetic entities are either not or only very weakly coupled.

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“…Throughout the years, many theoretical and experimental studies have been devoted to understanding the physics behind DPTs [2,3,[6][7][8][9][10][11][12][13][14][15][16]. Several analogies between thermodynamic and dynamic phase transitions, for instance, similar phase diagrams, have been shown in theoretical and experimental studies [6,[17][18][19]. In addition, DPTs have been studied in a diversity of models such as nanoscale systems [20][21][22], systems with surfaces [16,[23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Dynamic phase transitions on the kagome Ising ferromagnet

Vatansever

2022

Phys. Rev. E

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We perform extensive Monte Carlo simulations to investigate the dynamic phase transition properties of the two-dimensional kinetic Ising model on the kagome lattice in the presence of squarewave oscillating magnetic field. Through detailed finite-size scaling analysis, we study universality aspects of the non-equilibrium phase transition. Obtained critical exponents indicate that the two-dimensional kagome-lattice kinetic Ising model belongs to the same universality class with the corresponding Ising model in equilibrium. Moreover, dynamic critical exponent of the local moves used in simulations is determined with high precision. Our numerical results are compatible with the previous ones on kinetic Ising models.

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Experimental exploration of the vector nature of the dynamic order parameter near dynamic magnetic phase transitions

Cited by 11 publications

References 57 publications

Dynamic phase transition in classical Ising models

Dynamic phase transition in classical Ising models

Insertion layer magnetism detection and analysis using transverse magneto-optical Kerr effect (T-MOKE) ellipsometry

Dynamic phase transitions on the kagome Ising ferromagnet

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