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Tuning the magnetic properties of NiPS 3 through organic-ion intercalation

2021; Royal Society of Chemistry; Volume: 14; Issue: 4 Linguagem: Inglês

10.1039/d1nr07281a

2040-3372

Daniel Tezze, José M. Pereira, Yaiza Asensio, M. Ipatov, Francesco Calavalle, Fèlix Casanova, Alexander M. Bittner, M. Ormaza, Beatriz Martín‐García, Luis E. Hueso, Marco Gobbi,

MXene and MAX Phase Materials

Atomically thin van der Waals magnetic crystals are characterized by tunable magnetic properties related to their low dimensionality. While electrostatic gating has been used to tailor their magnetic response, chemical approaches like intercalation remain largely unexplored. Here, we demonstrate the manipulation of the magnetism in the van der Waals antiferromagnet NiPS3 through the intercalation of different organic cations, inserted using an engineered two-step process. First, the electrochemical intercalation of tetrabutylammonium cations (TBA+) results in a ferrimagnetic hybrid compound displaying a transition temperature of 78 K, and characterized by a hysteretic behavior with finite remanence and coercivity. Then, TBA+ cations are replaced by cobaltocenium via an ion-exchange process, yielding a ferrimagnetic phase with higher transition temperature (98 K) and higher remanent magnetization. Importantly, we demonstrate that the intercalation and cation exchange processes can be carried out in bulk crystals and few-layer flakes, opening the way to the integration of intercalated magnetic materials in devices.