Physics

Simulations of magnetization reversal in FM/AFM bilayers with THz frequency pulses (2023)
Journal Article
Hirst, J., Ruta, S., Jackson, J., & Ostler, T. (2023). Simulations of magnetization reversal in FM/AFM bilayers with THz frequency pulses. Scientific reports, 13(1), Article 12270. https://doi.org/10.1038/s41598-023-39175-6

It is widely known that antiferromagnets (AFMs) display a high frequency response in the terahertz (THz) range, which opens up the possibility for ultrafast control of their magnetization for next generation data storage and processing applications.... Read More about Simulations of magnetization reversal in FM/AFM bilayers with THz frequency pulses.

Three-dimensional topological magnetic monopoles and their interactions in a ferromagnetic meta-lattice (2023)
Journal Article
Rana, A., Liao, C., Iacocca, E., Zou, J., Pham, M., Lu, X., …Miao, J. (in press). Three-dimensional topological magnetic monopoles and their interactions in a ferromagnetic meta-lattice. Nature nanotechnology, https://doi.org/10.1038/s41565-022-01311-0

Topological magnetic monopoles (TMMs), also known as hedgehogs or Bloch points, are three-dimensional (3D) nonlocal spin textures that are robust to thermal and quantum fluctuations due to the topology protection1-4. Although TMMs have been observed... Read More about Three-dimensional topological magnetic monopoles and their interactions in a ferromagnetic meta-lattice.

Local Thermoelectric Response from a Single Néel Domain Wall (2022)
Journal Article
Puttock, R., Barton, C., Saugar, E., Klapetek, P., Fernández-Scarioni, A., Freitas, P., …Kazakova, O. (2022). Local Thermoelectric Response from a Single Néel Domain Wall. Science Advances, 8(47), https://doi.org/10.1126/sciadv.adc9798

Spatially resolved thermoelectric detection of magnetic systems provides a unique platform for the investigation of spintronic and spin caloritronic effects. Hitherto, these investigations have been resolution limited, confining analysis of the therm... Read More about Local Thermoelectric Response from a Single Néel Domain Wall.

Timescales and contribution of heating and helicity effect in helicity-dependent all-optical switching (2022)
Journal Article
Li, G., Zheng, X., Wang, J., Lu, X., Wu, J., Cai, J., …Xu, Y. (2023). Timescales and contribution of heating and helicity effect in helicity-dependent all-optical switching. Rare Metals, 42(1), 234-243. https://doi.org/10.1007/s12598-022-02117-8

The heating and helicity effects induced by circularly polarized laser excitation are entangled in the helicity-dependent all-optical switching (HD-AOS), which hinders understanding the magnetization dynamics involved. Here, applying a dual-pump lase... Read More about Timescales and contribution of heating and helicity effect in helicity-dependent all-optical switching.

Energy exchange dependent transient ferromagnetic like state of ultrafast magnetization dynamics (2022)
Journal Article
Gao, S., Liu, D., Zheng, T., Ostler, T., Chantrell, R., & Xu, C. (2022). Energy exchange dependent transient ferromagnetic like state of ultrafast magnetization dynamics. New Journal of Physics, 24(10), Article 103013. https://doi.org/10.1088/1367-2630/ac95ba

The study of laser-induced ultrafast magnetization dynamics is crucial for the development of information recording technology. Due to the complex mechanism, there is still a lack of comprehensive understanding for ultrafast magnetization dynamics. A... Read More about Energy exchange dependent transient ferromagnetic like state of ultrafast magnetization dynamics.

A Temperature Dependent Micromagnetic Model of the Antiferromagnet Mn 2 Au: A Multiscale Approach (2022)
Journal Article
Hirst, J., Atxitia, U., Ruta, S., Jackson, J., Petit, L., & Ostler, T. (2022). A Temperature Dependent Micromagnetic Model of the Antiferromagnet Mn 2 Au: A Multiscale Approach. Physical review B: Condensed matter and materials physics, 106(9), Article 094402. https://doi.org/10.1103/PhysRevB.106.094402

Antiferromagnets (AFMs) are strong candidates for the future spintronic and memory applications largely because of their inherently fast dynamics and lack of stray fields, with Mn2Au being one of the most promising. For the numerical modelling of mag... Read More about A Temperature Dependent Micromagnetic Model of the Antiferromagnet Mn 2 Au: A Multiscale Approach.

Timescales and contribution of heating and helicity effect in helicity-dependent all- optical switching (2022)
Journal Article
Li, G., Zheng, X., Wang, J., Lu, X., Wu, J., Cai, J., …Xu, Y. (in press). Timescales and contribution of heating and helicity effect in helicity-dependent all- optical switching. Rare Metals,

The manipulation of the magnetic direction by using the ultrafast laser pulse is attractive for its great advantages in terms of speed and energy efficiency for information storage applications. However, the heating and helicity effects induced by ci... Read More about Timescales and contribution of heating and helicity effect in helicity-dependent all- optical switching.

Unifying femtosecond and picosecond single-pulse magnetic switching in Gd-Fe-Co (2021)
Journal Article
Jakobs, F., Ostler, T. A., Lambert, C. H., Yang, Y., Salahuddin, S., Wilson, R. B., …Atxitia, U. (2021). Unifying femtosecond and picosecond single-pulse magnetic switching in Gd-Fe-Co. Physical Review B, 103(10), Article 104422. https://doi.org/10.1103/PhysRevB.103.104422

Many questions are still open regarding the physical mechanisms behind the magnetic switching in Gd-Fe-Co alloys by single optical pulses. Phenomenological models suggest a femtosecond scale exchange relaxation between sublattice magnetization as the... Read More about Unifying femtosecond and picosecond single-pulse magnetic switching in Gd-Fe-Co.

Role of element-specific damping in ultrafast, helicity-independent, all-optical switching dynamics in amorphous (Gd,Tb)Co thin films (2021)
Journal Article
Ceballos, A., Pattabi, A., El-Ghazaly, A., Ruta, S., Simon, C. P., Evans, R. F., …Hellman, F. (2021). Role of element-specific damping in ultrafast, helicity-independent, all-optical switching dynamics in amorphous (Gd,Tb)Co thin films. Physical Review B, 103(2), https://doi.org/10.1103/PhysRevB.103.024438

Ultrafast control of the magnetization in ps timescales by fs laser pulses offers an attractive avenue for applications such as fast magnetic devices for logic and memory. However, ultrafast helicity-independent all-optical switching (HI-AOS) of the... Read More about Role of element-specific damping in ultrafast, helicity-independent, all-optical switching dynamics in amorphous (Gd,Tb)Co thin films.

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