Summary
Louis Néel's "Le magnétisme et ses applications" (1970) presents the central thesis that understanding the microscopic origins of magnetism, particularly ferromagnetic and ferrimagnetic phenomena, is crucial for developing practical applications. The book systematically details the theoretical underpinnings of magnetic materials, including concepts like magnetic domains, hysteresis, and the influence of temperature on magnetic properties. It then translates this theoretical knowledge into a comprehensive survey of real-world uses, ranging from early magnetic storage technologies to the design of transformers and permanent magnets.
Readers gain a deep appreciation for the physics governing magnetism and its tangible impact on technology. The book provides detailed explanations of how magnetic principles are harnessed in diverse engineering fields, offering insights into the properties and behavior of various magnetic materials and the engineering challenges associated with their application. It serves as both a foundational text for students and a reference for practicing engineers interested in magnetic phenomena.
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Key concepts
- Magnetic Domains — Regions within ferromagnetic materials where the magnetic moments of atoms are aligned.
- Hysteresis — The lagging of magnetization behind the applied magnetic field in ferromagnetic materials, crucial for memory applications.
- Ferromagnetism — A strong form of magnetism where materials can be permanently magnetized.
- Ferrimagnetism — A form of magnetism exhibited by ferrites, where opposing magnetic moments partially cancel, resulting in a net magnetization.
- Curie Temperature — The temperature above which a ferromagnetic or ferrimagnetic material loses its spontaneous magnetism and becomes paramagnetic.