Temperature Chaos, Memory Effect, and Domain Fluctuations in the Spiral Antiferromagnet Dy

Kustov, S.; Liubimova, Iuliia; Corró, M.L.; Torrens‐Serra, J.; Wang, Xiebin; Haines, Charles R. S.; Salje, Ekhard K. H.

doi:10.1038/s41598-019-41566-7

Cited by 5 publications

(9 citation statements)

References 46 publications

(57 reference statements)

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“…The retraction of needle domains over larger temperature intervals is commonly observed [16,31,62] and has been explained in terms of the elastic properties of the ferroelastic domain structures [11,12]. Moreover, the collective response of such ferroelastic domain patterns displays hallmarks for a glassy behavior as in case of low temperature relaxations during friction experiments [46] with similarities to patterns in magnetic spiral systems [63]. The main issue is whether these very sensitive reactions to external forcing or the interaction between domains in the ferroelastic phase are purely elastic in nature or whether wall polarity plays a role [23,32,64,65].…”

Section: Discussionmentioning

confidence: 88%

Electrically driven ferroelastic domain walls, domain wall interactions, and moving needle domains

Ding

et al. 2019

Phys. Rev. Materials

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Ferroelastic domains generate polarity near domain walls via the flexoelectric effect. Applied electric fields change the wall dipoles and generate additional dipoles in the bulk. Molecular dynamics simulations show that the thickness of domain walls changes when an electric field is applied to the sample. Fields parallel to the walls lead to expansion of the wall thickness while fields perpendicular to the wall lead to shrinking of the wall thickness. The interactions between polar domain walls expand over more than 45 unit cells, the resulting forces change the wall-wall distances if pinning effects are small. The interaction increases nonlinearly with decreasing wall-wall distances favoring equal wall distances as the consequence of energy minimization under the constraints of a constant number of domain walls. Even for small groups of three walls the sequence of walls is locally periodic: assemblies of three parallel domain walls arrange themselves so that the intermediate domain wall is located exactly in the middle between the two outer walls. The driving force is appreciable if the distance between the outer domain walls is below approximately 30 lattice units. Pairs of domain walls often form needle domains where the shaft of the needle is ca. 3 lattice units wide. The movement of needle domains under applied electric field was simulated. The advancement and retraction of needles is larger in finite samples with charge-free surfaces than under periodic boundary conditions in the bulk. The needle tip moves even more freely when the sample surface is charged.

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Section: Discussionmentioning

confidence: 88%

Electrically driven ferroelastic domain walls, domain wall interactions, and moving needle domains

Ding

et al. 2019

Phys. Rev. Materials

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“…Recently, T-dot dependent IF was reported in polycrystalline Dy below the Néel temperature, in the ordered antiferromagnetic state [13] at an ultrasonic frequency close to 90 kHz. Since the T-dot effect was observed only in the magnetically ordered state, it had been attributed to the magnetic domain structure; more specifically, to the magnetic domain walls perpendicular to the c-axis (axis of the sixth order in the hexagonal structure), which carry magnetic moments.…”

Section: Magnetomechanical Internal Frictionmentioning

confidence: 99%

“…Since the T-dot effect was observed only in the magnetically ordered state, it had been attributed to the magnetic domain structure; more specifically, to the magnetic domain walls perpendicular to the c-axis (axis of the sixth order in the hexagonal structure), which carry magnetic moments. The possibility to observe T-dot effect at an ultrasonic frequency was associated in [13] with the presumably magnetic origin of losses, which are proportional to the frequency in the low-amplitude range. This proportionality compensates the inverse frequency dependence of the transitory IF, Equation (2), and makes the IF tr essentially frequency-independent up to a frequency approaching the frequency of domain wall relaxation.…”

Section: Magnetomechanical Internal Frictionmentioning

confidence: 99%

“…Dependences of the IF versus T-dot during interruptions of temperature scans provide more detailed information on the relative role of time-and T-dot-dependent terms in the IF spectrum [13]. Such dependences are depicted in Figure 8 for a Structure 1 sample with a/c TBs for interruptions of cooling at 233 and 193 K. The experimental results follow the same trend as has been reported in polycrystalline Dy [13] and interpreted as due to a superposition of several IF terms.…”

Section: T-dot Dependencementioning

confidence: 99%

Section: T-dot Dependencementioning

confidence: 99%

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Transitory Ultrasonic Absorption in “Domain Engineered” Structures of 10 M Ni-Mn-Ga Martensite

Kustov

Saren

D’Agosto

et al. 2021

Metals

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In this work we create in 10 M Ni-Mn-Ga martensitic samples special martensitic variant structures consisting of only three twins separated by two a/c twin boundaries: Type I and Type II, with relatively low and very high mobility, respectively. The “domain engineered” structure thus created allows us to investigate the dynamics of a single highly mobile a/c twin boundary (TB). We show that temperature variations between 290 and 173 K in our samples induce an intense transitory internal friction at ultrasonic frequencies ca. 100 kHz, peaking around 215 K. A comparison is made of the data for the “domain engineered” sample with the behaviour of reference samples without a/c TB. Reference samples have two different orientations of a/b twins providing zero and maximum shear stresses in a/b twinning planes. We argue, first, that the transitory internal friction, registered at rather high ultrasonic frequencies, has magnetic origin. It is related with the rearrangement of magnetic domain structure due to the motion of a/c twin boundary induced by thermal stresses. This internal friction term can be coined “magnetic transitory internal friction”. Magnetic transitory internal friction is a new category, linking the classes of transitory and magnetomechanical internal friction. Second, the structure of a/b twins is strongly non-equilibrium over a broad temperature range. As a consequence, the Young’s modulus values of the samples with maximum shear stress in a/b twinning planes can take any value between ca. 15 and 35 GPa, depending on the prehistory of the sample.

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Evidence for temperature chaos in spin glasses

2022

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We study the field cooled magnetization of a CuMn spin glass under temperature perturbations. The T -cycling curves are compared with the reference curve without temperature cycling. There is a crossover from the cumulative aging region to noncumulative aging region as the temperature change is increased. The cumulative aging range scales with the chaos length c, becoming comparable to the correlation length, ξ, at the crossover boundary. The extracted chaos exponent, ζ = 1.1, is in agreement with theoretical predictions. Our results strongly suggest temperature chaos exists in real spin glasses system. I. INTRODUCTIONThe equilibrium spin configuration in the spin glass phase [1-3] is predicted to reorient for arbitrarily small temperature variations on a length scale greater than, c (T 1 , T 2 ), the chaos length [3,4]. The temperature chaos (TC) effect was first exhibited through a renormalization group approach [5, 6] and T = 0 fixed point scaling arguments [3,4]. It has been studied analytically [7][8][9][10][11][12][13][14][15][16] and observed through simulations [17][18][19][20] on different lattice structures [21][22][23][24][25][26][27][28][29] by utilizing improved computable lattice sizes [30] and strategies [31][32][33][34][35][36][37], in both droplet-like [38][39][40][41] and replica symmetry breaking scenarios [42,43]. Apart from the many results obtained at equilibrium, a recent simulation study [44] exhibited the evidence of TC in nonequilibrium states using the Edwards-Anderson Ising spin glass model.

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Temperature Chaos, Memory Effect, and Domain Fluctuations in the Spiral Antiferromagnet Dy

Cited by 5 publications

References 46 publications

Electrically driven ferroelastic domain walls, domain wall interactions, and moving needle domains

Electrically driven ferroelastic domain walls, domain wall interactions, and moving needle domains

Transitory Ultrasonic Absorption in “Domain Engineered” Structures of 10 M Ni-Mn-Ga Martensite

Evidence for temperature chaos in spin glasses

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