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Magic Magnetic Field Viewing Film: A Window into the Invisible

Magnetic Field Viewing Film, often referred to as “Magnet Viewing Film” or “Magnetic Viewing Paper,” is an ingenious creation that allows us to peer into the invisible magnetic fields. This article will discuss the principles and applications of the magnetic field viewing film.

The Definition of Magnetic Fields

A magnetic field is a physical field that exists in space and influences objects by interacting through magnetic forces. Magnetic fields are typically generated by magnetic materials or electric currents, and they create magnetic field lines in their vicinity. These lines represent the direction and strength of the magnetic field. The way a magnetic field exerts forces on other objects, such as attraction or repulsion, depends on their position and properties within the magnetic field. Understanding and visualizing these fields, however, has been a challenge—until the advent of Magnetic Field Viewing Film.

The Principles of Magnetic Field Viewing Film

At its core, Magnetic Field Viewing Film relies on a remarkable property of ferrous (iron-containing) materials: they tend to align themselves with magnetic fields. The film consists of tiny iron particles suspended in a liquid that is then coated onto a plastic sheet. When exposed to a magnetic field, these iron particles align themselves along the field lines, creating visible patterns that we can observe. The result is a dynamic and captivating display of the magnetic landscape.

Magnetic Field Viewing Film can visualize different colors depending on the magnetic flux, why?

Magnetic Field Viewing Film

Image Source: apexmagnet

It is primarily due to the thin-film interference effect, which is a consequence of the arrangement of iron particles in the film and the interaction with light.

Microscopic Iron Particles: The Magnetic Field Viewing Film contains microscopic iron particles suspended in a liquid. When exposed to a magnetic field, these iron particles align along the field lines. This alignment causes the iron particles to form distinct patterns and structures within the film.

Thickness Variations: As the iron particles align, they create regions with varying thicknesses of the iron particle layer. Some areas have more densely packed iron particles, while others have fewer. This results in small variations in the thickness of the film across its surface.

Thin-Film Interference: Thin-film interference occurs when light interacts with thin films or layers of different refractive indices. In the case of the Magnetic Field Viewing Film, the iron particles have a different refractive index than the surrounding medium (the liquid and plastic film). When light passes through the film, it encounters these variations in thickness, and as a result, some wavelengths of light interfere constructively while others interfere destructively.

Color Perception: The constructive interference of certain wavelengths of light produces bright or vivid colors, while the destructive interference results in dark regions or regions with different colors. These color variations are a visual representation of the differences in the magnetic field strength across the film. The specific colors observed may vary based on the film’s design and the materials used.


CMS Magnetics

Image Source: CMS Magnetics

The Applications of Magnetic Field Viewing Film

The applications of Magnetic Field Viewing Film span various domains. Let’s explore a few of them:

Education and Outreach: In the realm of education, Magnetic Field Viewing Film serves as an invaluable tool. It brings abstract magnetic field concepts to life, captivating students and enthusiasts alike. Through interactive demonstrations, the film simplifies complex ideas, making them accessible and engaging.

Research and Development: Magnetic Field Viewing Film is a critical asset in research and development settings. Magnet designers and engineers use it to visualize and fine-tune magnetic structures, ensuring optimal performance. It aids in designing more efficient motors, generators, and magnetic assemblies.

Quality Control: In manufacturing, ensuring the quality and uniformity of magnets is paramount. Magnetic Field Viewing Film helps identify irregularities or defects in magnetic components, allowing for quality control and consistency in production.



Magnetic Field Viewing Film has not only made magnetic fields tangible but also opened up new horizons for exploration. It has empowered educators, researchers, and enthusiasts to engage with and understand the invisible forces that shape our world. The film’s simplicity, accessibility, and captivating nature have made it an indispensable tool, enriching our understanding of magnets and magnetism. It is, quite simply, a remarkable window into the magnetic world—a world that was once hidden but is easy now for all to explore.

At Tengye, we’re thrilled to be early participants in your new projects. Our passion for magnets extends from material selection and design optimization to providing magnetic solutions. We hope to bring our knowledge and experience to the forefront by actively engaging in your upcoming projects.




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Jonah Jin

Jonah Jin
Managing Director

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