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Scientists have figured out how to simplify read heads and at the same time double the storage density in hard drives

The history of magnetic media is definitely in an upward phase. It is no coincidence that analysts call our days the “golden age” of hard drives, although they predict its imminent end.

Further evidence of the rapid progress in magnetic data recording technology can be considered the development of British scientists from the National Physical Laboratory (the leading research center in Teddington near London, founded in 1900). They have proposed a completely new read head design that is said to help overcome some of the fundamental barriers to increasing storage density.

First, we are talking about a limitation that prevents a decrease in the size of the areas in which information is recorded, and the distance between them. As you know, information is presented in the form of the orientation of the magnetic field of the sections of the ferromagnetic substance. Reducing the distance between sites is prevented by their mutual influence.

Another problem is the impossibility of reducing the read and write head in proportion to the decrease in areas and the distance between them. The fact is that current constantly flows through the head, and a decrease in the head is accompanied by an increase in energy losses and an increase in heat generation. In turn, the heat from the head can change the magnetic orientation of the read area.

The fundamental cause of these problems is the way the reading head works. The magnetic field induces small changes in head resistance, which are determined by measuring the voltage drop. This principle is implemented using a rather cumbersome mechanism, which is difficult to further miniaturize.

At the same time, it is possible to radically simplify the design of the head by using a combination of magnetostrictive and electrostrictive materials (magnetostrictive material changes its size under the action of a magnetic field, electrostrictive material under the action of an electric field). The laminated structure of these materials can generate an electric current when exposed to a magnetic field. An electrostrictive layer sandwiched between two magnetostrictive ones generates a weak electric current every time the head passes near the magnetic domain.

As stated, the sensitivity of such a head is comparable to that of more traditional heads using the magnetoresistive effect, but has a smaller number of layers – 7 instead of 15 in modern hard drive heads. Moreover, since the current is generated only when the head passes over the area with the recording, and its resistance is very small, much less and the dissipated heat. Finally, the absence of a DC power supply helps to reduce power consumption and simplify design. It is the simplification of the design that is perhaps the biggest advantage.

While the above remains at the level of an idea – there is not even a prototype of a new head – but, according to the source, there are no technical obstacles that could prevent its implementation. In this case, already at the first stage of implementation, new heads would help to double the recording density.

Sources: Ars Technica, Journal of Physics D, Applied Physics

P.S. For those interested in technical details – the original article in the Journal of Physics D, Applied Physics (PDF, 308 KB).

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