Submicrometer resolution far field high sensitivity Kerr microscopy for in-plane magnetization detection.

Area of Science:

• Magnetism and Optics
• Materials Science
• Nanotechnology

Background:

• Magneto-optical systems are crucial for characterizing magnetic materials.
• Traditional systems often struggle with detecting in-plane magnetization components with high sensitivity.
• Existing methods may require complex configurations or compromise spatial resolution.

Purpose of the Study:

• To demonstrate that a far-field magneto-optical system, designed for polar (off-plane) magnetization, can effectively detect in-plane magnetization.
• To maintain high sensitivity and spatial resolution in the detection of in-plane magnetization.
• To provide a method for eliminating in-plane sensitivity when only off-plane detection is desired.

Main Methods:

• Utilizing symmetric illumination and photoelastic modulation in a vertical optical axis system.
• Employing a high numerical aperture objective lens to focus a laser beam onto the sample.
• Implementing an aperture to filter out off-axis light for selective in-plane sensitivity removal.

Main Results:

• The system successfully detects in-plane magnetization without compromising sensitivity.
• High spatial resolution of 500 nm is achieved at a wavelength of 514 nm.
• The aperture effectively removes in-plane sensitivity, allowing for selective detection.

Conclusions:

• The developed magneto-optical system offers versatile detection capabilities for both off-plane and in-plane magnetization.
• This technique enhances the toolkit for magnetic characterization at the nanoscale.
• The system provides a flexible and sensitive approach for studying magnetic phenomena.