science

Programmable magnet

Programmable magnet is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Programmable magnet rather than just read about it. In short: Programmed magnets are magnetic structures that incorporate correlated patterns of magnets with alternating polarity, designed to achieve a desired behavior and deliver stronger local force. By varying the magnetic fields and strengths, different mechanical behaviors can be controlled.

Key takeaways

Programmable magnet belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Programmable magnet to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Programmable magnet from memory before moving on to harder problems.

Reference excerpt

Programmed magnets are magnetic structures that incorporate correlated patterns of magnets with alternating polarity, designed to achieve a desired behavior and deliver stronger local force. By varying the magnetic fields and strengths, different mechanical behaviors can be controlled. Correlated magnet pairs can be programmed to attract or repel with a prescribed force and engagement distance, or, to attract or repel at a certain spatial orientation. Correlated magnets can be programmed to interact only with other magnetic structures that have been coded to respond. Correlated magnets can even be programmed to attract and repel at the same time. Compared to conventional magnets, the correlated magnet provides much stronger holding force to the target and stronger shear resistance. The programmable behavior is achieved by creating multipole structures comprising multiple magnetic elements of varying size, location, orientation, and saturation. The sizes range 1 to 4 mm. By overlapping, a very intricate magnetic field can be produced. There are four main functions that correlated magnets can achieve: align, attach, latch, and spring. Programmed magnets can be programmed, or coded, by varying the polarity and/or field strengths of each source of the arrays of magnetic sources that make up each structure. The resulting magnetic structures can be one-dimensional, two-dimensional, three-dimensional, and even four-dimensional if produced using an electromagnetic array. Correlated magnetic structures can be developed from ferrites, rare-earth materials (e.g. Neodymium magnet, Samarium–cobalt magnet), ceramics, and electromagnets alike, and the correlation effects are scalable from very large permanent magnets to nanometer-scale devices. Multipole magnetic devices may be constructed from discrete permanent magnets, or by exposing heated magnetizable material to a coded magnetic field. The science of correlated magnetics was created in 2008 by Larry W. Fullerton in his laboratory at Cedar Ridge in North Alabama. Correlated Magnetics Research (CMR) was formed to pursue research and development of the coded magnets technology and to license the technology to business entities across industry. More than 65 patents have been filed for the technology in the U.S. and around the world. CMR trademarked the term "Polymagnets" for this technology. The coding theory used to design radio frequency signals in communication and radar is applied to form the magnetic regions of correlated magnets. The discovery was announced during a press conference in October, 2009, in Huntsville, Alabama. The world first's 3D magnetizing printer is developed by CMR, which is called MagPrinter. This printer consists of a magnetizing coil in a cabinet with a motion-control system. A programmed magnet can be easily made from reprogramming a conventional magnetic material in a few minutes.

Applications For the small size applications, correlated magnets can be used in positioning devices, consumer electronics, magnetic couplings, and vehicle attachment. Potential applications include attach and release work-holding mechanisms, magnetic separators, fluid seals and valves, motor and motion control, factory automation, prosthetics, security devices, and power generation.

References

Worked examples

Example 1 — a first encounter with Programmable magnet

Start with the simplest possible case. Write down what Programmable magnet claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Programmable magnet before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Programmable magnet ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Programmable magnet

In research: Programmable magnet appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Programmable magnet in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Programmable magnet is common in secondary-school and first-year university syllabi. It links to neighbouring topics Types of magnets, so understanding it makes those chapters shorter.
In everyday life: Look for Programmable magnet outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Programmable magnet in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Programmable magnet means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Programmable magnet out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Programmable magnet in simple terms?

Why does Programmable magnet matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Programmable magnet?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Programmable magnet.