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Rectangular AlNiCo Magnet

Updated: 2026-07-15

Overview

Rectangular AlNiCo magnets are a type of permanent magnet made from an alloy of aluminum, nickel, and cobalt. These magnets are known for their high magnetic strength and excellent temperature stability, making them suitable for demanding industrial and scientific applications. AlNiCo magnets were among the first widely used permanent magnets and remain popular due to their reliability and resistance to demagnetization. Their rectangular shape is particularly useful in applications requiring precise magnetic field alignment.

Structure and Working Principle

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The structure of rectangular AlNiCo magnets is based on a crystalline alloy that includes aluminum, nickel, and cobalt, often with small amounts of other metals like copper or titanium. The magnetic properties are achieved through a heat treatment process that aligns the magnetic domains within the material. These magnets operate by maintaining a stable magnetic field without requiring an external power source. Their rectangular shape allows for efficient use in devices where space constraints or specific field geometries are critical.

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Key Features

Rectangular AlNiCo magnets offer several key features, including high magnetic strength, excellent temperature stability (up to 500°C), and good corrosion resistance. These properties make them ideal for use in harsh environments. Another notable feature is their resistance to demagnetization, which ensures long-term performance in applications like electric motors and sensors. Their rectangular form factor also provides versatility in design and integration.

Application Areas

Rectangular AlNiCo magnets are widely used in industrial sensors, electric motors, and medical devices. Their stability and strength make them suitable for precision instruments and high-performance applications. In the automotive industry, they are used in speed sensors and ignition systems. In healthcare, they find applications in MRI machines and surgical tools. Their reliability also makes them a preferred choice in aerospace and defense technologies.

Maintenance and Precautions

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To ensure longevity, rectangular AlNiCo magnets should be protected from mechanical shocks and extreme temperatures. Exposure to strong demagnetizing fields should also be avoided. Regular inspection for physical damage or corrosion is recommended. Proper storage in a dry, temperature-controlled environment can help maintain their magnetic properties over time.

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B2B Procurement Guide

When procuring rectangular AlNiCo magnets, consider factors such as magnetic strength, temperature range, and dimensional tolerances. Suppliers should provide detailed specifications and testing reports. Bulk purchases may offer cost advantages, but ensure quality consistency. Working with reputable manufacturers or distributors is crucial to avoid counterfeit or substandard products. Custom sizes and grades may be available for specialized applications.

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