But they also found that even
very small magnetic fields were enough to prevent thermal fluctuations from flipping electron spins.
The researchers showed that they could control the transition temperature of the CGT flake using surprisingly
small magnetic fields of 0.3 tesla or less.
This is how the identification of
smallest magnetic fields with diamond sensors works: in the tiny diamond tip, two adjacent carbon atoms are being removed and one of the resulting vacancies is replaced by a nitrogen atom.
Van der Wiel: «The fact that the effect is so dramatic and occurs even
in small magnetic fields at room temperature makes this result very special.»
With the help of the electrons of the resulting nitrogen vacancy center,
even smallest magnetic fields can be detected with a resolution of a few nanometers thanks to nuclear magnetic resonance (NMR) spectroscopy.
Also, external electromagnets are capable of generating larger magnetic field strengths than is possible for planar microcoils, but their large size translates into
much smaller magnetic field gradients and their larger inductance leads to slower switching times.»
«POINTER uses a system of electrically -
small magnetic field loops to generate a field of energy that can penetrate most material,» said Price.
These sensors can measure
very small magnetic fields, enabling Wheeler to place the magnet and sensor farther from each other than was previously possible.
Tarduno explains that solar winds could interact with the Earth's atmosphere to create
a small magnetic field, even in the absence of a core dynamo.
Current suppression in
a small magnetic field can ultimately be traced back to the famous Pauli exclusion principle, the quantum mechanical principle that states that no two electrons (fermions) may have identical quantum numbers.
In certain magnetic materials, the electrical conductivity of a thin layer of material changes in steps as
a small magnetic field is varied, increasing and decreasing in jumps of a certain size.
«The origin of the magnetic field in this region is not understood, but it is likely that
a smaller magnetic field is stretched out as the filaments are elongated by the gravitational influence of the black hole and stars in the Galactic center.»
The small magnetic field is induced by an interaction between the ionosphere and the solar wind, [13] rather than by an internal dynamo in the core like the one inside the Earth.
This sensitivity enables the NV - magnetoscope to detect very
small magnetic fields — such as that produced by nano - and mesoscale magnetic materials, for example — by reading optical fluorescence emitted by the excited NV centers.