Interfacial negative magnetization in Ni encapsulated layer-tunable nested MoS₂ nanostructure with robust memory...

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Investigating magnetism in low-dimensional diamagnetic systems like molybdenum disulfide (MoS2) is crucial.
• Interfacial interactions and layer-number tunability are key factors in controlling magnetic properties.

Purpose of the Study:

• To explore the evolution of magnetism in MoS2-based hybrid nanostructures.
• To investigate the magnetization dynamics of Ni nanophases encapsulated in MoS2.
• To understand the potential for thermomagnetic memory effects.

Main Methods:

• Encapsulation of 12 nm Ni nanophases within MoS2.
• Magnetization dynamics studied from 2-300 K.
• Density Functional Theory (DFT) calculations for interfacial interactions.
• DC magnetization and relaxation measurements with varying protocols.
• Time-dependent magnetization studies.

Main Results:

• Discovery of a negative magnetization state with giant exchange bias in the Ni/MoS2 hybrid.
• Observation of a reversible, temperature-induced increase in spin magnetic moment and coercivity.
• DFT confirmed interfacial charge transfer and spin-polarized density of states.
• Evidence of robust thermoremanent magnetization, indicating memory effects.
• Identification of negative magnetization and charge transfer as key contributors to the memory effect.

Conclusions:

• The Ni/MoS2 hybrid nanostructure exhibits unique magnetic properties, including negative magnetization and giant exchange bias.
• The system demonstrates robust thermomagnetic memory, potentially useful for data storage applications.
• The memory effect is tunable via temperature and external magnetic fields, offering control over its properties.