Pulsating regime of magnetic deflagration in crystals of molecular magnets

Modestov, Mikhail; Bychkov, Vitaly; Marklund, Mattias

doi:10.1103/physrevb.83.214417

Cited by 17 publications

(39 citation statements)

References 39 publications

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“…[26][27][28] Pseudocombustion phenomena have been encountered in materials science already in the context of spin avalanches in crystals of nanomagnets. [29][30][31][32] However, the fronts of spin switching are quite difficult for experimental observation. 29,30 On the contrary, the electrochemical doping process provides a fascinating opportunity to observe directly and investigate a number of interesting nonlinear phenomena: front propagation, multidimensional instabilities, and pattern formation, with surprisingly different outcome for p and n fronts.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics of corrugated doping fronts in organic optoelectronic devices

et al. 2012

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Recently, it was demonstrated that electrochemical doping fronts in organic semiconductors exhibit a new fundamental instability growing from multidimensional perturbations [Bychkov et al., Phys. Rev. Lett. 107, 016103 (2011)]. In the instability development, linear growth of tiny perturbations goes over into a nonlinear stage of strongly distorted doping fronts. Here we develop the nonlinear theory of the doping front instability and predict the key parameters of a corrugated doping front, such as its velocity, in close agreement with the experimental data. We show that the instability makes the electrochemical doping process considerably faster. We obtain the self-similar properties of the front shape corresponding to the maximal propagation velocity, which allows for a wide range of controlling the doping process in the experiments. The developed theory provides the guide for optimizing the performance of organic optoelectronic devices such as light-emitting electrochemical cells.

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Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics of corrugated doping fronts in organic optoelectronic devices

et al. 2012

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“…In contrast to the slow magnetic deflagration studied in the absolute majority of works on the subject [3][4][5][6][14][15][16][17][18], recent experiments presented in Ref. [19] detected ultrafast spin avalanches propagating at a speed comparable to the sound speed in the crystals, ≈2000 m/s.…”

Section: Introductionmentioning

confidence: 89%

“…So far the theoretical models of spin avalanches in crystals of nanomagnets have taken into account only thermal conduction and have neglected volume viscosity [14][15][16][17]; in this section we use the same approach and consider the influence of only thermal conduction. Volume viscosity will be taken into account in the next section.…”

Section: A Basic Equationsmentioning

confidence: 99%

“…When all or most of the molecules of a crystal are initially in the metastable state, then local heating by an external source may trigger local spin flipping, with Zeeman energy released in the heated region and transported to the next layer of the crystal [3][4][5][6][14][15][16][17][18]. The heat facilitates spin flipping in the next layer and so on, so that the process spreads in a crystal as a thin, self-supporting magnetization front, spin avalanche, well localized spatially.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic detonation structure in crystals of nanomagnets controlled by thermal conduction and volume viscosity

et al. 2015

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Citation for the original published paper (version of record):Jukimenko, O., Modestov, M., Marklund, M., Bychkov, V. (2015) Magnetic detonation structure in crystals of nanomagnets controlled by thermal conduction and volume viscosity. (2011)]. Here magnetic detonation structure is investigated by taking into account transport processes of the crystals such as thermal conduction and volume viscosity. The transport processes result in smooth profiles of the most important thermodynamical crystal parameters, temperature, density, and pressure, all over the magnetic detonation front, including the leading shock, which is one of the key regions of magnetic detonation. In the case of zero volume viscosity, thermal conduction leads to an isothermal discontinuity instead of the shock, for which temperature is continuous while density and pressure experience jump. It is also demonstrated that the thickness of the magnetic detonation front may be controlled by applying the transverse-magnetic field, which is important for possible experimental observations of magnetic detonation. Physical

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“…In nanomagnet crystals, the process of spin flipping from the metastable to stable state may happen in a form of spin avalanche known as magnetic deflagration [14][15][16][17][18][19]. In this process, the spin flipping is triggered locally, e.g., by external heating, and the stored magnetic (Zeeman) energy is released as thermal phonon energy.…”

Section: Introductionmentioning

confidence: 99%

Multilevel model for magnetic deflagration in nanomagnet crystals

et al. 2017

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We extend the existing theoretical model for determining the characteristic features of magnetic deflagration in nanomagnet crystals. For the first time, all energy levels are accounted for calculation of the the Zeeman energy, the deflagration velocity, and other parameters. It reduces the final temperature and significantly changes the propagation velocity of the spin-flipping front. We also consider the effect of a strong transverse magnetic field, and show that the latter significantly modifies the spin-state structure, leading to an uncertainty concerning the activation energy of the spin flipping. Our front velocity prediction for a crystal of Mn12-acetate in a longitudinal magnetic field is in much better agreement with experimental data than the previous reduced-model results.

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Pulsating regime of magnetic deflagration in crystals of molecular magnets

Cited by 17 publications

References 39 publications

Nonlinear dynamics of corrugated doping fronts in organic optoelectronic devices

Nonlinear dynamics of corrugated doping fronts in organic optoelectronic devices

Magnetic detonation structure in crystals of nanomagnets controlled by thermal conduction and volume viscosity

Multilevel model for magnetic deflagration in nanomagnet crystals

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