Low-dimensional materials are engineered to have reduced dimensions, leading to unique electronic, optical, and magnetic properties distinct from their bulk counterparts. Among these, two-dimensional (2D) materials are confined in two dimensions, resulting in a single layer of atoms or molecules with exceptional electrical conductivity and magnetic strength.
In the field of magnetism, the discovery of long-range magnetic order in 2D van der Waals (vdW) materials has opened new avenues for spintronic applications. These materials exhibit magnetic ordering even at the monolayer scale and up to room temperature, challenging the predictions of the Mermin-Wagner theorem, which posited that such order is unstable in low-dimensional systems due to thermal fluctuations.
The weak interlayer exchange coupling, resulting from the vdW gaps between layers, provides an ideal platform to manipulate magnetic structures. This characteristic enables the exploration of novel magnetic properties, including noncollinear spin configurations, coherent and incoherent magnon excitations, and exchange bias interactions at interfaces. These features are crucial for developing next-generation spintronic devices, which leverage the spin and orbital of electrons for information processing and storage. Moreover, the interlayer coupling in these materials can be modulated through various methods, such as hydrostatic pressure, allowing for dynamic control of their magnetic properties. This tunability is essential for the development of flexible and reconfigurable spintronic applications.
In this project, we will focus on exploring the magnetic structure and the behavior of metamagnetic transitions, along with the spin and orbital torque responses in van der Waals (vdW) ferromagnetic and antiferromagnetic systems. We will investigate magnon dynamics, considering both spin and orbital angular momentum excitation through microwave, THz emission, and heat gradients in vdW materials. Due to the weak energy gap resulting from the weak exchange coupling, magnon populations can be more efficiently and easily manipulated. This research aims to provide valuable insights into spin-orbitronic materials and their potential applications in angular momentum excitation, transportation, and energy conversion.