An Invisible Reverse Magnet Cloak

Experts try to build a "reverse magnet cloak" to make objects invisible in magnetic field.

It is reported that scientists are trying to develop a "reverse magnet cloak" which can stealth the magnetic field, which allows the magnetic field to "ignore" the object. Scientists say this device can be widely used in safety and medical fields.

Previously, scientists have proposed the idea of stopping the magnetic field. Now, the new design, published in the new physics journal, can even make magnetic materials "invisible" to the magnetic field.

In recent years, a number of scientists have tried to use metamaterials to develop invisible cloaks in the film "Harry Potter", which have made people or objects invisible to light, and have achieved success on small objects or light waves in a limited range of colors. Supermaterial is an artificial composite structure or composite material with abnormal physical properties that natural materials do not possess. It can guide electromagnetic waves in a manner that does not exist in nature.

John Pan Derui, a theoretical physicist at Imperial College in London, known by the scientific community as the founder of the field of metamaterials, in 2008, in a paper published in the natural materials science, proved that the principle that objects are invisible to light can also be used to make objects invisible to the magnetic field.

The chief author of the latest research, Professor alba Sanchez of the University of Autonoma Barcelona, Spain, explained that light and magnetism are two aspects of the same physical force, so many of the basic principles of a light invisibility cloak are also applicable to the development of a cloak of invisible magnetic field.

Sanchez said: "in the past 150 years, magnetism is very important in the field of technology. We know very well how to make magnetic fields, but we know little about how to eliminate magnetic fields in a given space. This is a very interesting idea, but we have never developed the final product. " So he and his colleagues decided to develop a cloak that can make objects invisible to magnetic fields.

The idea is that an internal cloak, made of superconducting materials, surrounds a few layers of supermaterials that react differently to the magnetic field, so that the object is "invisible" to the magnetic field. "We also need to consider the question of finding a very concise way to make this' anti - magnetic cloak 'more practical," Sanchez said. In addition, by simply adding a layer of superconducting layer, the magnetic field from the neodymium magnets inside the cloak may also be eliminated, which means that such an anti - magnet can make the magnetic field blind to any substance, even the magnet itself. "However, Sanchez also admits that there may be many challenges in the actual development process.

The team is now working on a working anti - magnet, which Sanchez says can be used in the energy production process that plays an important role in many fields, in addition to medical and safety, and it can also hide "magnetic signals" from submarines or underwater mines.

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