Magnetic and magnetocaloric properties of Py/Gd/CoFe/IrMn stacks

Polushkin, N. I.; Pashen’kin, I. Yu.; Fadeev, E.; Lähderanta, E.; Фраерман, А. А.

doi:10.1016/j.jmmm.2019.165601

Cited by 9 publications

(7 citation statements)

References 20 publications

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“…In a nanostructured trilayer consisting of one free and one pinned ferromagnetic layers, separated by a weakly ferromagnetic spacer, a field of the order of 100 Oe is sufficient to switch the outer ferromagnetic layers from parallel to antiparallel alignment and thereby reduce the effective exchange field in the spacer, which in turn leads to its demagnetization [9,10]. Such trilayer systems have been rather intensively studied recently, both in experiments and theoretically [11][12][13][14][15][16][17][18][19]. As regards MCE, first discussed by Fraerman and Shereshevskii [13], these studies have mostly been indirect experimentally (via magnetometry) and phenomenological in terms of modeling [13,[15][16][17][18][19], which introduces model-dependent uncertainties in the conclusions drawn.…”

Section: Introductionmentioning

confidence: 99%

“…Such trilayer systems have been rather intensively studied recently, both in experiments and theoretically [11][12][13][14][15][16][17][18][19]. As regards MCE, first discussed by Fraerman and Shereshevskii [13], these studies have mostly been indirect experimentally (via magnetometry) and phenomenological in terms of modeling [13,[15][16][17][18][19], which introduces model-dependent uncertainties in the conclusions drawn.…”

Section: Introductionmentioning

confidence: 99%

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Proximity-Enhanced Magnetocaloric Effect in Ferromagnetic Trilayers

Persson¹,

Kulyk²,

Kravets³

et al. 2022

Preprint

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The demagnetization and associated magnetocaloric effect in strong-weak-strong ferromagnetic trilayers, upon a reorientation of the strong ferromagnets from parallel to antiparallel magnetization, is simulated using atomistic spin dynamics. The simulations yield non-trivial spin distributions in the antiparallel state, which in turn allows entropy to be calculated directly. Empirical functional forms are obtained for the magnetization distribution in the spacer, differing significantly from some of the commonly used models. Finally, we find that the magnetocaloric effect in the system can be significantly improved by allowing the local exchange to vary through the spacer, which in practice can be implemented by spatially tailoring the spacer's magnetic dilution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Proximity-Enhanced Magnetocaloric Effect in Ferromagnetic Trilayers

Persson¹,

Kulyk²,

Kravets³

et al. 2022

Preprint

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show abstract

“…The system studied is a few nanometers thick spacer of refrigerant sandwiched by ferromagnetic layers whose Curie temperatures are substantially higher ( " strong" ferromagnets) than T C of the spacer. In the context of this study, an important parameter is the exchange coupling strength acting at the interfaces between the refrigerant and its " strongly" ferromagnetic surroundings [8][9][10][11][12][13][14]. A magnetic field not bigger than a few hundred oersted applied to such a system induces switching of magnetization in a softer surrounding.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of magnetocaloric efficiency of Gd spacer between strong ferromagnets

Yu.

Polushkin

Сапожников

et al. 2022

Physics of the Solid State

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The magnetocaloric properties of a thin spacer of gadolinium (Gd) between layers of "strong" ferromagnets (relatively high Curie temperatures) are studied experimentally. It is found that, at room temperatures, the magnetocaloric efficiency Delta S/Delta H (Delta S is the isothermal magnetic entropy change and Delta H is the range of applied magnetic fields) of Gd spacer of thickness of 3 nm is up to two orders in magnitude higher than this value in an individual thicker (30 nm) Gd layer. This opens up opportunities for using the magnetocaloric effect in micro(nano)electronics and biomedicine using relatively weak magnetic fields H<1 kOe. The observed increase in the magnetocaloric efficiency is explained by the influence of direct exchange coupling between Gd spacer and its surroundings, which changes the distribution of magnetization in the spacer and, ultimately, its magnetocaloric potential. Keywords: magnetocaloric effect, magnetic heterostructures, exchange coupling at interfaces, Curie temperature.

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“…In a nanostructured trilayer consisting of one free and one pinned ferromagnetic layer, separated by a weakly ferromagnetic spacer, a field of the order of 10 mT is sufficient to switch the outer ferromagnetic layers from parallel (P) to antiparallel (AP) alignment and thereby reduce the effective exchange field in the spacer, which in turn leads to its demagnetization [9,10]. Such trilayer systems have been rather intensively studied recently, both in experiments and theoretically [11][12][13][14][15][16][17][18][19]. As regards MCE, first discussed by Fraerman and Shereshevskii [13], these studies have mostly been indirect experimentally (via magnetometry) and phenomenological in terms of modeling [13,[15][16][17][18][19], which introduces modeldependent uncertainties in the conclusions drawn.…”

Section: Introductionmentioning

confidence: 99%

“…Such trilayer systems have been rather intensively studied recently, both in experiments and theoretically [11][12][13][14][15][16][17][18][19]. As regards MCE, first discussed by Fraerman and Shereshevskii [13], these studies have mostly been indirect experimentally (via magnetometry) and phenomenological in terms of modeling [13,[15][16][17][18][19], which introduces modeldependent uncertainties in the conclusions drawn.…”

Section: Introductionmentioning

confidence: 99%

Proximity-enhanced magnetocaloric effect in ferromagnetic trilayers

Persson

Kulyk

Kravets

et al. 2022

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The demagnetization and associated magnetocaloric effect in strong-weak-strong ferromagnetic trilayers, upon a reorientation of the strong ferromagnets from parallel to antiparallel magnetization, is simulated using atomistic spin dynamics. The simulations yield non-trivial spin distributions in the antiparallel state, which in turn allows entropy to be calculated directly. The influence of longer-range spin-spin interactions and of variable strength of the external switching field are investigated. Finally, we find that the magnetocaloric effect in the system can be significantly improved by allowing the local exchange to vary through the spacer, which in practice can be implemented by spatially tailoring the spacer's magnetic dilution.

show abstract

Magnetic and magnetocaloric properties of Py/Gd/CoFe/IrMn stacks

Cited by 9 publications

References 20 publications

Proximity-Enhanced Magnetocaloric Effect in Ferromagnetic Trilayers

Proximity-Enhanced Magnetocaloric Effect in Ferromagnetic Trilayers

Enhancement of magnetocaloric efficiency of Gd spacer between strong ferromagnets

Proximity-enhanced magnetocaloric effect in ferromagnetic trilayers

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