Temperature-Dependent Compensation Points in Gd_xFe_1-x Ferrimagnets

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spintronics

Background:

• Ferrimagnets exhibit distinct spin wave handedness at compensation temperatures, enabling advanced magnonic applications.
• Understanding factors influencing these compensation points is crucial for designing novel spintronic devices.

Purpose of the Study:

• To investigate how Gd composition, external magnetic fields, and antiferromagnetic exchange strength affect the compensation temperatures in GdFe ferrimagnets.
• To explore the impact of these factors on the resonance frequency of ferrimagnetic materials.

Main Methods:

• Atomistic-level spin dynamics simulations were employed to model GdFe alloys.
• Systematic variation of Gd composition, external magnetic field, and antiferromagnetic exchange strength.

Main Results:

• Increasing Gd composition linearly increases both magnetization and angular momentum compensation temperatures.
• External magnetic fields and antiferromagnetic exchange strength also modulate compensation temperatures.
• Antiferromagnetic exchange strength influences resonance frequency, splitting it into two linearly increasing branches in the absence of an external field.

Conclusions:

• GdFe ferrimagnets offer tunable compensation temperatures and resonance frequencies.
• This research provides fundamental insights into compensated ferrimagnets for chirality-based spintronics.
• Findings may accelerate the development of advanced magnonic and spintronic applications.