# Ferromagnetism in chiral multilayer 2D semimetals

## TL;DR

This paper investigates the temperature-dependent ferromagnetic ordering in multilayer graphene with magnetic impurities, showing that stacking sequence enhances magnetic interactions and predicting transition temperatures within experimental reach.

## Contribution

It introduces a model for carrier-mediated magnetic interactions in chiral multilayer graphene, revealing ferromagnetism due to stacking sequence effects and calculating transition temperatures.

## Key findings

- Multilayer graphene exhibits ferromagnetism due to enhanced density of states.
- Transition temperatures are within experimentally accessible range.
- Magnetic ordering is influenced by stacking sequence and impurity concentration.

## Abstract

We calculate the temperature dependent long-range magnetic coupling in the presence of dilute concentrations of random magnetic impurities in chiral multilayer two-dimensional semimetals, i.e., undoped intrinsic multilayer graphene. Assuming a carrier-mediated indirect RKKY exchange interaction among the well-separated magnetic impurities with the itinerant carriers mediating the magnetic interaction between the impurities, we investigate the magnetic properties of intrinsic multilayer graphene using an effective chiral Hamiltonian model. We find that due to the enhanced density of states in the rhombohedral stacking sequence of graphene layers, the magnetic ordering of multilayer graphene is ferromagnetic in the continuum limit. The ferromagnetic transition temperature is calculated using a finite-temperature self-consistent field approximation and found to be within the experimentally accessible range for reasonable values of the impurity-carrier coupling.