Deep spin-glass hysteresis-area collapse and scaling in the three-dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>±</mml:mo><mml:mi>J</mml:mi></mml:mrow></mml:math>Ising model

Sarıyer, Ozan S.; Kabakçıoğlu, Alkan; Berker, A. Nihat

doi:10.1103/physreve.86.041107

Cited by 11 publications

(8 citation statements)

References 57 publications

(88 reference statements)

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“…We think that focusing on hysteresis and loop area properties of the studied system may be good and powerful ways to determine and investigate of the spin glass behavior. Recently, this type of calculation has been done and spin glass phase properties of the d = 3 ±J Ising model have been elucidated in detail within the framework of hard spin mean field theory [56].…”

Section: Discussionmentioning

confidence: 99%

“…In this region, the time dependent magnetization is able to follow the external magnetic field with some delay whereas this is not the case for low temperatures and small magnetic field amplitudes. The mechanism shortly described above points out the existence a DPT [41], and theoretical point of view, a number of studies concerning the DPTs as well as hysteresis properties of different type systems under the time dependent perturbation have been performed by using well known methods such as Monte Carlo simulation [43,44,45,46,47,48,49,50], effective field theory [51,52,53], mean field theory [41,46,54,55] as well as hard spin mean field theory [56].…”

Section: Introductionmentioning

confidence: 99%

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Time dependent magnetic field effects on the±J Ising model

Vatansever

Akıncı

Polat

2013

Journal of Magnetism and Magnetic Materials

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Nonequilibrium phase transition properties of the ±J Ising model under a time dependent oscillating perturbation are investigated within the framework of effective field theory for a two-dimensional square lattice. After a detailed analysis, it is found that the studied system exhibits unusual and interesting behaviors such as reentrant phenomena, and the competition between ferromagnetic and antiferromagnetic exchange interactions gives rise to destruct the dynamic first order phase transitions as well as dynamic tricritical points. Furthermore, according to Néel nomenclature, the magnetization profiles have been found to obey Q-type, L-type and P-type classification schemes under certain conditions. Finally, it is observed that the treatment of critical percolation with applied field amplitude strongly depends upon the frequency of time varying external field.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Time dependent magnetic field effects on the±J Ising model

Vatansever

Akıncı

Polat

2013

Journal of Magnetism and Magnetic Materials

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“…In addition, the total magnetization of a spin glass system exhibits a hysteresis loop, so the area of the hysteresis loop depends on the magnetic field sweep rate. Theoretically, the hysteresis area becomes larger at faster sweep rates, and at lower temperatures 51 . In a scenario where the resistivity decreases when the magnetization decreases, the magnetic field history, sweeping direction, sweep rate, and temperature dependence of our data are all consistent with the magnetization of the glassy features explained above.…”

Section: Origin Of the Dynamical Magnetotransport Featurementioning

confidence: 99%

Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures

Wolgast

Öztürk

et al. 2015

Phys. Rev. B

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The recent conjecture of a topologically-protected surface state in SmB 6 and the verification of robust surface conduction below 4 K have prompted a large effort to understand the surface states.Conventional Hall transport measurements allow current to flow on all surfaces of a topological insulator, so such measurements are influenced by contributions from multiple surfaces of varying transport character. Instead, we study magnetotransport of SmB 6 using a Corbino geometry, which can directly measure the conductivity of a single, independent surface. Both (011) and (001) crystal surfaces show a strong negative magnetoresistance at all magnetic field angles measured.The (011) surface has a carrier mobility of 122 cm 2 /V·sec with a carrier density of 2.5×10 13 cm −2 , which are significantly smaller than indicated by Hall transport studies. This mobility value can explain a failure so far to observe Shubnikov-de Haas oscillations. Analysis of the angle-dependence of conductivity on the (011) surface suggests a combination of a field-dependent enhancement of the carrier density and a suppression of Kondo scattering from native oxide layer magnetic moments as the likely origin of the negative magnetoresistance. Our results also reveal a hysteretic behavior whose magnitude depends on the magnetic field sweep rate and temperature. Although this feature becomes smaller when the field sweep is slower, does not disappear or saturate during our slowest sweep-rate measurements, which is much slower than a typical magnetotransport trace.These observations cannot be explained by quantum interference corrections such as weak antilocalization, but are more likely due to an extrinsic magnetic effect such as the magnetocaloric effect or glassy ordering.

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“…In particular, coercivity -which is defined as the required amount of the external magnetic field to reduce the magnetization of a material to zero-is an essential physical property of magnetic materials which has a significant importance in technological applications. Moreover, it is worth to note that hysteresis loops of equilibrium systems exhibit coercivity in ferromagnetic phase [59] whereas coercive fields in nonequilibrium systems driven by an oscillating field are always observed in the dynamic paramagnetic phase.…”

mentioning

confidence: 99%

Dynamic phase transition properties and hysteretic behavior of a ferrimagnetic core–shell nanoparticle in the presence of a time dependent magnetic field

Yüksel¹,

Vatansever²,

Polat³

2012

J. Phys.: Condens. Matter

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We have presented dynamic phase transition features and stationary-state behavior of a ferrimagnetic small nanoparticle system with a core-shell structure. By means of detailed Monte Carlo simulations, a complete picture of the phase diagrams and magnetization profiles have been presented and the conditions for the occurrence of a compensation point Tcomp in the system have been investigated. According to Néel nomenclature, the magnetization curves of the particle have been found to obey P-type, N-type and Q-type classification schemes under certain conditions. Much effort has been devoted to investigation of hysteretic response of the particle and we observed the existence of triple hysteresis loop behavior which originates from the existence of a weak ferromagnetic core coupling Jc/J sh , as well as a strong antiferromagnetic interface exchange interaction Jint/J sh . Most of the calculations have been performed for a particle in the presence of oscillating fields of very high frequencies and high amplitudes in comparison with exchange interactions which resembles a magnetic system under the influence of ultrafast switching fields. Particular attention has also been paid on the influence of the particle size on the thermal and magnetic properties, as well as magnetic features such as coercivity, remanence and compensation temperature of the particle. We have found that in the presence of ultrafast switching fields, the particle may exhibit a dynamic phase transition from paramagnetic to a dynamically ordered phase with increasing ferromagnetic shell thickness.

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Deep spin-glass hysteresis-area collapse and scaling in the three-dimensional±JIsing model

Cited by 11 publications

References 57 publications

Time dependent magnetic field effects on the±J Ising model

Time dependent magnetic field effects on the±J Ising model

Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures

Dynamic phase transition properties and hysteretic behavior of a ferrimagnetic core–shell nanoparticle in the presence of a time dependent magnetic field

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