17 citations · 47 across the 6 of their papers we have counts for
6 papers
Berry Curvature and Topological Hall Effect in Magnetic Nanoparticles
Ahsan Ullah, Balamurugan Balasubramanian, Bibek Tiwari +4
Analytical calculations and micromagnetic simulations are used to determine the Berry curvature and topological Hall effect (THE) due to conduction electrons in small ferromagnetic…
Topological phase transitions and Berry-phase hysteresis in exchange-coupled nanomagnets
Ahsan Ullah, Xin Li, Yunlong Jin +6
Topological phase in magnetic materials yields a quantized contribution to the Hall effect known as the topological Hall effect, which is often caused by skyrmions, with each skyrm…
Chiral Spin Bobbers in Exchange-Coupled Hard-Soft Magnetic Bilayers
Xiaohang Zhang, Tieren Gao, Lei Fang +11
The spin structure of exchange-coupled MnBi:Co-Fe bilayers is investigated by X-ray magnetic circular dichroism (XMCD), polarized neutron reflectometry (PNR), and micromagnetic sim…
Inverse magnetocaloric effect in synthetic antiferromagnets
D. M. Polishchuk, M. Persson, M. M. Kulyk +5
The magnetocaloric effect in exchange-coupled synthetic-antiferromagnet multilayers is investigated experimentally and theoretically. We observe a temperature-controlled inversion…
Magneto-optical properties of topological insulator thin films with broken inversion symmetry
k. Rahim, A. Ullah, M. Tahir +1
We determine the optical response of ultrathin film topological insulators in the presence of a quantizing external magnetic field taking into account both hybridization between su…
Optical Conductivity of Topological Insulator Thin Films in a Quantizing Magnetic Field
A. Ullah, K. Sabeeh
We determine the optical response of topological insulator thin films in the presence of a quantizing, external magnetic field. We explicitly take into account hybridization betwee…