Theoretical Study of Magnon Spin Currents in Chromium Trihalide Hetero-bilayers: Implications for Magnonic and Spintronic Devices

ACS Applied Nano Materials American Chemical Society (ACS) 5:10 (2022) 15150-15161

Authors:

Doried Ghader, Heng Gao, Paolo G Radaelli, Alessandra Continenza, Alessandro Stroppa

Cryogenic temperature growth of Sn thin films on ferromagnetic Co(0001)

Advanced Materials Interfaces Wiley 9:36 (2022) 2201452

Authors:

Leszek Gladzcuk, Lukasz Gladczuk, Piotr Dluzewski, Pavlo Aleshkevych, Artem Lynnyk, Gerrit van der Laan, Thorsten Hesjedal

Abstract:

Topological electronic materials hold great promise for revolutionizing spintronics, owing to their topological protected, spin-polarized conduction edge or surface state. One of the key bottlenecks for the practical use of common binary and ternary topological insulator (TI) materials is the large defect concentration which leads a high background carrier concentration. Elemental tin in its α-phase is a room temperature topological semimetal, which is intrinsically less prone to defect-related shortcomings. Recently, the growth of ultrathin α-Sn films on ferromagnetic Co surfaces has been achieved, however, thicker films are needed to reach the 3D topological Dirac semimetallic state. Here, the growth of α-Sn films on Co at cryogenic temperatures was explored. Very low-temperature growth holds the promise of suppressing undesired phases, alloying across the interfaces, as well as the formation of Sn pillars or hillocks. Nevertheless, the critical Sn layer thickness of ∼3 atomic layers, above which the film partially transforms into the undesired β-phase, remains the same as for room-temperature growth. From ferromagnetic resonance studies, and supported by electron microscopy, it can be concluded that for cryogenic Sn layer growth, the interface between Sn and Co remains sharp and the magnetic properties of the Co layer stay intact.

Depth-dependent magnetic crossover in a room-temperature skyrmion-hosting multilayer

(2022)

Authors:

Tj Hicken, Mn Wilson, Z Salman, T Prokscha, A Suter, Fl Pratt, Sl Zhang, G van der Laan, T Hesjedal, T Lancaster

Breathing mode dynamics of coupled three-dimensional chiral bobbers

APL Materials AIP Publishing 10 (2022) 101107

Authors:

Pedram Bassirian, Thorsten Hesjedal, Stuart SP Parkin, Kai Litzius

Abstract:

Recently, three-dimensional (3D) magnetic textures have moved into the focus of spintronics as both technologically relevant and physically intriguing on a fundamental level. A rich variety of 3D textures is currently being investigated; however, their unambiguous experimental detection and detailed study remains challenging. In this work, a new type of chiral 3D spin-texture, consisting of two antiferromagnetically coupled Néel bobbers, is explored. The static properties of this structure depend on the chirality of the individual bobbers. Different chirality combinations are studied with regard to their phase stability regions by micromagnetic simulations and compared to antiferromagnetically coupled skyrmion tubes. Furthermore, the coupled internal breathing modes are investigated by application of a periodically alternating external magnetic field. The breathing modes of each studied system possess a unique fingerprint, which might allow for the identification of the resonating spin textures via their dispersion curves.

Wafer-scale epitaxial growth of the thickness-controllable van der Waals ferromagnet CrTe2 for reliable magnetic memory applications

(2022)

Authors:

Xufeng Kou, Xinqi Liu, Yunyouyou Xia, Lei Gao, Puyang Huang, Liyang Liao, Baoshan Cui, Dirk Backes, Gerrit van der Laan, Thorsten Hesjedal, Yuchen Ji, Peng Chen, Fan Wu, Meixiao Wang, Junwei Zhang, Guoqiang Yu, Cheng Song, Yulin Chen, Zhongkai Liu, Yumeng Yang, Yong Peng, Gang Li, Qi Yao