TITLE : Footprints of Chiral Magnetism through Remanence Measurements

ABSTRACT :

Non trivial magnetic textures in chiral magnets originating from Dzyaloshinskii Moriya Interaction (DMI) driven spin-canting are important from fundamental and application point of view. Single Ion anisotropy (SIA) is another mechanism to stabilize spin-canting in these otherwise antiferromagnets (AFM). I would present remanence measurements on such spin-canted- AFMs oxides, which are also symmetry allowed piezo magnets (PzM). These data reveal an ultra-slow magnetization relaxation phenomenon, leading to a quasi-static remanence with a counter intuitive magnetic field dependence. I will first establish the generality of the phenomenon by showing the existence of this unique remanence in a number of DMI driven canted AFM. I would show that the magnitude of this remanence bears a correlation with spin-canting angle and the Neel Temperature. I would further establish how this remanence is fundamentally different from the one observed in other routine or complex magnetic systems including spin glasses or super paramagnets. I would demonstrate possible ways to harness it near the room temperature through size & interface effects, that arise from encapsulation of such canted –AFM / PzM inside carbon nanotubes . I would also show how this approach paves the way for nano-spintronic devices based on these Oxide@ CNT based hybrids.

MEETING DETAILS :

Speaker: Dr. Ashna Bajpai , Department of Physics, IISER Pune

Venue: A1-NKN, South Campus, IIT Mandi

Date and Time: Thursday, March 20, 2025, 05:00 pm (IST)