Transient ferromagnetic-like state mediating ultrafast reversal of antiferromagnetically coupled spins

Radu, I.; Vahaplar, K.; Stamm, C.; Kachel, T.; Pontius, N.; Dürr, H. A.; Ostler, T. A.; Barker, J.; Evans, R. F.L.; Chantrell, R. W.; Tsukamoto, A.; Itoh, A.; Kirilyuk, A.; Rasing, Th; Kimel, A. V.

doi:10.1038/nature09901

Substrate Induced Strain Field in FeRh Epilayers Grown on Single Crystal MgO (001) Substrates (2017)
Journal Article
Barton, C. W., Ostler, T. A., Huskisson, D., Kinane, C. J., Haigh, S. J., Hrkac, G., & Thomson, T. (2017). Substrate Induced Strain Field in FeRh Epilayers Grown on Single Crystal MgO (001) Substrates. Scientific reports, 7, Article 44397. https://doi.org/10.1038/srep44397

Equi-Atomic FeRh is highly unusual in that it undergoes a first order meta-magnetic phase transition from an antiferromagnet to a ferromagnet above room temperature (T r â ‰ 370 K). This behavior opens new possibilities for creating multifunctional m... Read More about Substrate Induced Strain Field in FeRh Epilayers Grown on Single Crystal MgO (001) Substrates.

Modeling the thickness dependence of the magnetic phase transition temperature in thin FeRh films (2017)
Journal Article
Ostler, T. A., Barton, C., Thomson, T., & Hrkac, G. (2017). Modeling the thickness dependence of the magnetic phase transition temperature in thin FeRh films. Physical Review B, 95(6), Article 064415. https://doi.org/10.1103/PhysRevB.95.064415

FeRh and its first-order phase transition can open new routes for magnetic hybrid materials and devices under the assumption that it can be exploited in ultra-thin-film structures. Motivated by experimental measurements showing an unexpected increase... Read More about Modeling the thickness dependence of the magnetic phase transition temperature in thin FeRh films.

Effects of interactions on the relaxation processes in magnetic nanostructures (2016)
Journal Article
Atkinson, L. J., Ostler, T. A., Hovorka, O., Wang, K. K., Lu, B., Ju, G. P., …Chantrell, R. W. (2016). Effects of interactions on the relaxation processes in magnetic nanostructures. Physical Review B, 94(13), Article 134431. https://doi.org/10.1103/PhysRevB.94.134431

Controlling the relaxation of magnetization in magnetic nanostructures is key to optimizing magnetic storage device performance. This relaxation is governed by both intrinsic and extrinsic relaxation mechanisms and with the latter strongly dependent... Read More about Effects of interactions on the relaxation processes in magnetic nanostructures.

Thermally induced magnetization switching in Gd/Fe multilayers (2016)
Journal Article
Xu, C., Ostler, T. A., & Chantrell, R. W. (2016). Thermally induced magnetization switching in Gd/Fe multilayers. Physical Review B, 93(5), Article 054302. https://doi.org/10.1103/PhysRevB.93.054302

A theoretical model of Gd/Fe multilayers is constructed using the atomistic spin dynamics formalism. By varying the thicknesses and number of layers we have shown that a strong dependence of the energy required for thermally induced magnetization swi... Read More about Thermally induced magnetization switching in Gd/Fe multilayers.

Optimal electron, phonon, and magnetic characteristics for low energy thermally induced magnetization switching (2015)
Journal Article
Atxitia, U., Ostler, T. A., Chantrell, R. W., & Chubykalo-Fesenko, O. (2015). Optimal electron, phonon, and magnetic characteristics for low energy thermally induced magnetization switching. Applied physics letters, 107(19), Article 192402. https://doi.org/10.1063/1.4935416

Using large-scale computer simulations, we thoroughly study the minimum energy required to thermally induced magnetization switching (TIMS) after the application of a femtosecond heat pulse in transition metal-rare earth ferrimagnetic alloys. We find... Read More about Optimal electron, phonon, and magnetic characteristics for low energy thermally induced magnetization switching.

The Landau-Lifshitz equation in atomistic models (2015)
Journal Article
Ellis, M. O., Evans, R. F., Ostler, T. A., Barker, J., Atxitia, U., Chubykalo-Fesenko, O., & Chantrell, R. W. (2015). The Landau-Lifshitz equation in atomistic models. Low Temperature Physics, 41(9), 705-712. https://doi.org/10.1063/1.4930971

The Landau-Lifshitz (LL) equation, originally proposed at the macrospin level, is increasingly used in Atomistic Spin Dynamic (ASD) models. These models are based on a spin Hamiltonian featuring atomic spins of fixed length, with the exchange introdu... Read More about The Landau-Lifshitz equation in atomistic models.

Ultrafast and Distinct Spin Dynamics in Magnetic Alloys (2015)
Journal Article
Radu, I., Stamm, C., Eschenlohr, A., Radu, F., Abrudan, R., Vahaplar, K., …Rasing, T. (2015). Ultrafast and Distinct Spin Dynamics in Magnetic Alloys. SPIN, 5(3), Article 1550004. https://doi.org/10.1142/S2010324715500046

Controlling magnetic order on ultrashort timescales is crucial for engineering the next-generation magnetic devices that combine ultrafast data processing with ultrahigh-density data storage. An appealing scenario in this context is the use of femtos... Read More about Ultrafast and Distinct Spin Dynamics in Magnetic Alloys.

Strain Induced Vortex Core Switching in Planar Magnetostrictive Nanostructures (2015)
Journal Article
Ostler, T. A., Cuadrado, R., Chantrell, R. W., Rushforth, A. W., & Cavill, S. A. (2015). Strain Induced Vortex Core Switching in Planar Magnetostrictive Nanostructures. Physical review letters, 115(6), Article 067202. https://doi.org/10.1103/PhysRevLett.115.067202

The dynamics of magnetic vortex cores is of great interest because the gyrotropic mode has applications in spin torque driven magnetic microwave oscillators, and also provides a means to flip the direction of the core for use in magnetic storage devi... Read More about Strain Induced Vortex Core Switching in Planar Magnetostrictive Nanostructures.

Laser induced magnetization reversal for detection in optical interconnects (2014)
Journal Article
Azim, Z. A., Fong, X., Ostler, T., Chantrell, R., & Roy, K. (2014). Laser induced magnetization reversal for detection in optical interconnects. IEEE Electron Device Letters, 35(12), 1317-1319. https://doi.org/10.1109/LED.2014.2364232

Optical interconnect has emerged as the front-runner to replace electrical interconnect especially for off-chip communication. However, a major drawback with optical interconnects is the need for photodetectors and amplifiers at the receiver, impleme... Read More about Laser induced magnetization reversal for detection in optical interconnects.

Temperature-dependent ferromagnetic resonance via the Landau-Lifshitz-Bloch equation: Application to FePt (2014)
Journal Article
Ostler, T. A., Ellis, M. O., Hinzke, D., & Nowak, U. (2014). Temperature-dependent ferromagnetic resonance via the Landau-Lifshitz-Bloch equation: Application to FePt. Physical review B: Condensed matter and materials physics, 90(9), Article 094402. https://doi.org/10.1103/PhysRevB.90.094402

Using the Landau-Lifshitz-Bloch (LLB) equation for ferromagnetic materials, we derive analytic expressions for temperature-dependent absorption spectra as probed by ferromagnetic resonance. By analyzing the resulting expressions, we can predict the v... Read More about Temperature-dependent ferromagnetic resonance via the Landau-Lifshitz-Bloch equation: Application to FePt.

Ultrafast thermally induced magnetic switching in synthetic ferrimagnets (2014)
Journal Article
Evans, R. F., Ostler, T. A., Chantrell, R. W., Radu, I., & Rasing, T. (2014). Ultrafast thermally induced magnetic switching in synthetic ferrimagnets. Applied physics letters, 104(8), Article 082410. https://doi.org/10.1063/1.4867015

Synthetic ferrimagnets are composite magnetic structures formed from two or more anti-ferromagnetically coupled magnetic sublattices with different magnetic moments. Here, we report on atomistic spin simulations of the laser-induced magnetization dyn... Read More about Ultrafast thermally induced magnetic switching in synthetic ferrimagnets.

Atomistic spin model simulations of magnetic nanomaterials (2014)
Journal Article
Evans, R. F., Fan, W. J., Chureemart, P., Ostler, T. A., Ellis, M. O., & Chantrell, R. W. (2014). Atomistic spin model simulations of magnetic nanomaterials. Journal of Physics: Condensed Matter, 26(10), Article 103202. https://doi.org/10.1088/0953-8984/26/10/103202

Atomistic modelling of magnetic materials provides unprecedented detail about the underlying physical processes that govern their macroscopic properties, and allows the simulation of complex effects such as surface anisotropy, ultrafast laser-induced... Read More about Atomistic spin model simulations of magnetic nanomaterials.

Two-magnon bound state causes ultrafast thermally induced magnetisation switching (2013)
Journal Article
Barker, J., Atxitia, U., Hovorka, O., Ostler, T. A., Chubykalo-Fesenko, O., & Chantrell, R. W. (2013). Two-magnon bound state causes ultrafast thermally induced magnetisation switching. Scientific reports, 3, Article 3262. https://doi.org/10.1038/srep03262

There has been much interest recently in the discovery of thermally induced magnetisation switching using femtosecond laser excitation, where a ferrimagnetic system can be switched deterministically without an applied magnetic field. Experimental res... Read More about Two-magnon bound state causes ultrafast thermally induced magnetisation switching.

Ultrafast dynamical path for the switching of a ferrimagnet after femtosecond heating (2013)
Journal Article
Atxitia, U., Ostler, T., Barker, J., Evans, R. F., Chantrell, R. W., & Chubykalo-Fesenko, O. (2013). Ultrafast dynamical path for the switching of a ferrimagnet after femtosecond heating. Physical review B: Condensed matter and materials physics, 87(22), https://doi.org/10.1103/PhysRevB.87.224417

Ultrafast laser-induced magnetic switching in rare earth-transition metal ferrimagnetic alloys has recently been reported to occur by ultrafast heating alone. Using atomistic simulations and a ferrimagnetic Landau-Lifshitz-Bloch formalism, we demonst... Read More about Ultrafast dynamical path for the switching of a ferrimagnet after femtosecond heating.

Classical spin model of the relaxation dynamics of rare-earth doped permalloy (2012)
Journal Article
Ellis, M. O., Ostler, T. A., & Chantrell, R. W. (2012). Classical spin model of the relaxation dynamics of rare-earth doped permalloy. Physical review B: Condensed matter and materials physics, 86(17), Article 174418. https://doi.org/10.1103/PhysRevB.86.174418

In this paper, the ultrafast dynamic behavior of rare-earth doped permalloy is investigated using an atomistic spin model with Langevin dynamics. In line with experimental work, the effective Gilbert damping is calculated from transverse relaxation s... Read More about Classical spin model of the relaxation dynamics of rare-earth doped permalloy.

Ultrafast heating as a sufficient stimulus for magnetization reversal in a ferrimagnet (2012)
Journal Article
Ostler, T. A., Barker, J., Evans, R. F., Chantrell, R. W., Atxitia, U., Chubykalo-Fesenko, O., …Kimel, A. V. (2012). Ultrafast heating as a sufficient stimulus for magnetization reversal in a ferrimagnet. Nature communications, 3, Article 666. https://doi.org/10.1038/ncomms1666

The question of how, and how fast, magnetization can be reversed is a topic of great practical interest for the manipulation and storage of magnetic information. It is generally accepted that magnetization reversal should be driven by a stimulus repr... Read More about Ultrafast heating as a sufficient stimulus for magnetization reversal in a ferrimagnet.

Crystallographically amorphous ferrimagnetic alloys: Comparing a localized atomistic spin model with experiments (2011)
Journal Article
Ostler, T. A., Evans, R. F., Chantrell, R. W., Atxitia, U., Chubykalo-Fesenko, O., Radu, I., …Kimel, A. (2011). Crystallographically amorphous ferrimagnetic alloys: Comparing a localized atomistic spin model with experiments. Physical review B: Condensed matter and materials physics, 84(2), https://doi.org/10.1103/PhysRevB.84.024407

We present a computational model of crystallographically amorphous ferrimagnetic alloys using a stochastic Landau-Lifshitz-Gilbert equation of motion for atomistic spins and an atomistic spin Hamiltonian with Heisenberg exchange. The spontaneous equi... Read More about Crystallographically amorphous ferrimagnetic alloys: Comparing a localized atomistic spin model with experiments.

Transient ferromagnetic-like state mediating ultrafast reversal of antiferromagnetically coupled spins (2011)
Journal Article
Radu, I., Vahaplar, K., Stamm, C., Kachel, T., Pontius, N., Dürr, H. A., …Kimel, A. V. (2011). Transient ferromagnetic-like state mediating ultrafast reversal of antiferromagnetically coupled spins. Nature, 472(7342), 205-209. https://doi.org/10.1038/nature09901

Ferromagnetic or antiferromagnetic spin ordering is governed by the exchange interaction, the strongest force in magnetism. Understanding spin dynamics in magnetic materials is an issue of crucial importance for progress in information processing and... Read More about Transient ferromagnetic-like state mediating ultrafast reversal of antiferromagnetically coupled spins.

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