science

Spin transistor

Spin transistor 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 Spin transistor rather than just read about it. In short: The magnetically sensitive transistor, also known as the spin transistor, spin field-effect transistor (spinFET), Datta–Das spin transistor or spintronic transistor (named for spintronics, the technology which this development spawned), originally proposed in 1990 by Supriyo Datta and Biswajit Das, is an alternative design on the common transistor invented in the 1940s. This device was considered one of the Nature m…

Key takeaways

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

Reference excerpt

The magnetically sensitive transistor, also known as the spin transistor, spin field-effect transistor (spinFET), Datta–Das spin transistor or spintronic transistor (named for spintronics, the technology which this development spawned), originally proposed in 1990 by Supriyo Datta and Biswajit Das, is an alternative design on the common transistor invented in the 1940s. This device was considered one of the Nature milestones in spin in 2008. A new all-electric all-semiconductor design was later developed as an alternative approach to realizing spin transistor functionality in a CMOS-compatible platform.

Description

The spin transistor comes about as a result of research on the ability of electrons (and other fermions) to naturally exhibit one of two (and only two) states of spin: known as "spin up" and "spin down". Thus, spin transistors operate on electron spin as embodying a two-state quantum system. Unlike its namesake predecessor, which operates on an electric current, spin transistors operate on electrons on a more fundamental level; it is essentially the application of electrons set in particular states of spin to store information. One advantage over regular transistors is that these spin states can be detected and altered without necessarily requiring the application of an electric current. This allows for detection hardware (such as disk read-and-write heads) that are much smaller but even more sensitive than today's devices, which rely on noisy amplifiers to detect the minute charges used on today's data storage devices. The potential result is devices that can store more data in less space and consume less power, using less costly materials. The increased sensitivity of spin transistors is also being researched in creating more sensitive automotive sensors, a move being encouraged by a push for environmentally friendlier vehicles. A second advantage of a spin transistor is that the spin of an electron is semi-permanent and can be used as means of creating cost-effective non-volatile solid state storage that does not require the constant application of current to sustain. It is one of the technologies being explored for magnetic random access memory (MRAM). Because of its high potential for practical use in the computer world, spin transistors are currently being researched in various firms throughout the world, such as in England and in Sweden. By the mid‑2010s, several breakthroughs had enabled the fabrication the production of spin transistors, using readily available substances (e.g., carbon nanotubes), that can operate at room temperature: a precursor to commercial viability.

References

Worked examples

Example 1 — a first encounter with Spin transistor

Start with the simplest possible case. Write down what Spin transistor 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 Spin transistor 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 Spin transistor 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 Spin transistor

In research: Spin transistor 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 Spin transistor 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: Spin transistor is common in secondary-school and first-year university syllabi. It links to neighbouring topics Spintronics, Transistor types, so understanding it makes those chapters shorter.
In everyday life: Look for Spin transistor 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 Spin transistor in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Spin transistor 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 Spin transistor out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Spin transistor in simple terms?

Why does Spin transistor 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 Spin transistor?

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 Spin transistor.