“…A novel unexpected finding is also reported: the trend to suppress the spin-glass behavior for high excitation pulse energies. …”
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“…Furthermore, the exchange bias effect is observed for the first time in pure α-MnO(2) phase due to the coupling of the surface spin glass with the antiferromagnetic α-MnO(2) matrix. …”
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“…The spin-glass like behavior was rather weak and vanished at higher fields. …”
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“…The Curie temperature is negative, implying an analogy with spin-glass. The Curie-Weiss behavior provides a pathway to an ideal glass state, a state with long-range correlation without lattice periodicity, which is characterized by highly diverse local structures, reminiscent of spin-glass.…”
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“…The compound is reported to display evidence of spin glass behavior but possess a non-frozen magnetic ground state below the transition temperature. …”
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“…We observe a development of a cluster spin glass, where the Ising-like Ni(2+) magnetic moments demonstrate a 2D correlated slow short-range dynamics already at 12 K, whereas the formation of 3D short range static ordered clusters occurs far below the spin-glass freezing temperature at T ~ 4 K as it can be seen from the (7)Li NMR spectrum.…”
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“…Another striking result is that exchange bias effect, ascribed to the percolating ferromagnetic domains coexisting with spin glass phase, is notably enhanced by nonmagnetic Pd(Pt) addition. …”
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“…Further studies showed that this SEB was attributable to interaction of superspin glass (SSG) and antiferromagnetic matix, which was triggered by the crossover of SSG from canonical spin glass to a cluster spin glass. Our results not only explain the underlying physics of SEB, but also provide a way to tune and control the SEB performance.…”
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“…Depending on the external magnetic field, two types of spin-glass were identified and analyzed in correlation with the exchange field acting on octahedral and tetrahedral iron sites. …”
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“…GF magnets have, like all solid-state systems, randomly located impurities whose magnetic moments may “freeze” at low temperatures, making the system enter a spin-glass state. We analyse the available data for spin-glass transitions in GF materials and find a surprising trend: the glass-transition temperature grows with decreasing impurity concentration and reaches a finite value in the impurity-free limit at a previously unidentified, “hidden”, energy scale. …”
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“…The static (dc) and dynamic (ac) responses of magnetization revealed the spin-glass behaviour of the investigated samples. Both scaling law and Vogel–Fulcher law provide a satisfactory fit to our experimental results which are considered as a salient feature of the spin-glass system. …”
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“…The alloy undergoes a ferromagnetic transition across T(C) ∼ 212 K and a weak-antiferromagnetic transition across T(t) ∼ 180 K followed by a spin-glass transition below T(f) ∼ 51.85 K. A second-order phase transition across T(C) with mixed short and long-range magnetic interactions is confirmed through the critical exponent study and universal scaling of magnetic entropy and magnetoresistance. …”
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“…I give explicit correspondences between the microscopic variables of the spin-glass model and those of the present dynamical system model. …”
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“…In turn, the decrease in crystallite size caused a change in the magnetic order, from antiferromagnetic for bulk material and nanocrystals after 1 and 3 h of milling to spin-glass with the freezing temperature T(f) = 20 K for the sample after 5 h of milling. …”
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“…This paper discusses such transitions in exactly solvable spin glass models and in globular random heteropolymers and their relation to glass transitions in molecular fluids and polymers. …”
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“…The M(FC) (T) curves indicated the existence of super-spin glass (SSG) behavior below T(s) (spin-glass freezing temperature). …”
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“…One is the canonical spin-glass transition at 90 K, and the other is a ferromagnetic correlation that appears below 300 K. …”
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“…We also describe the properties of this metallic spin-glass phase.…”
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“…This book covers all principal aspects of currently investigated frustrated systems, from exactly solved frustrated models to real experimental frustrated systems, going through renormalization group treatment, Monte Carlo investigation of frustrated classical Ising and vector spin models, low-dimensional systems, spin ice and quantum spin glass. The reader can - within a single book - obtain a global view of the current research development in the field of frustrated systems.This new edition is updated with recent theoretical, numerical and experimental developments in the field of frustrated…”
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“…The unidirectional exchange-bias anisotropy is associated with the spin-coupling at the ferrimagnetic/spin glass-like interface; it is observable only at low temperatures after a field-cooling process. …”
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