Simple quadratic magneto-optic Kerr effect measurement system using permanent magnets

Area of Science:

• Condensed Matter Physics
• Materials Science
• Magnetism and Spintronics

Background:

• The quadratic magneto-optic Kerr effect (QMOKE) is crucial for studying higher-order spin-orbit interactions.
• Investigating these interactions is vital for understanding magnetic thin films and heterostructures.
• Existing QMOKE measurement systems can be complex and expensive.

Purpose of the Study:

• To design and construct a simple, cost-effective QMOKE measurement system.
• To demonstrate the system's capability in measuring QMOKE signals from magnetic materials.
• To report the first QMOKE signal measurement from an Fe3O4 single crystal.

Main Methods:

• Developed a novel QMOKE measurement setup utilizing permanent magnets within a rotatable ferromagnetic yoke.
• Employed a rotating field method to extract quadratic and linear MOKE components under saturation.
• Validated the system's sensitivity and applicability to single crystals and thin films.

Main Results:

• Successfully constructed a cost-effective and sensitive QMOKE measurement system.
• The system accurately captures both linear and quadratic MOKE signals.
• Achieved the first-ever reported QMOKE signal measurement from an Fe3O4 single crystal.

Conclusions:

• The developed permanent magnet-based QMOKE system offers a simple and affordable alternative for advanced magnetic characterization.
• This technology facilitates the investigation of spin-orbit interactions in various magnetic materials.
• The successful measurement from Fe3O4 single crystal opens new avenues for exploring its magnetic properties.