Magnet

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Physics Professor Markus Greiner (in back) and his team — Anton Mazurenko (from left), senior grad student, Daniel Greif, postdoc fellow, Geoffrey Ji, graduate student, and Christie Chiu (not shown) — have created an antiferromagnet, an exotic form of matter that can give important insights into how room temperature superconductors might be created.

Figuring out superconductors

Physicists create antiferromagnet that may help develop, monitor key materials

Science|

DateJune 1, 2017November 12, 2018

Magnetic field intensity (left) and topography (right) of the moon centered over the giant 2,400 kilometer-diameter crater known as South Pole-Aitken impact basin. Significant quantities of metallic iron from the projectile were deposited on the northern rim of the basin that became magnetized in the presence of a magnetic field, forming several large magnetic anomalies. Low values of both the magnetic field strength and topography are plotted in blue colors, which grade to red for high values.

Magnetism on the moon

Researchers believe that powerful anomalies there resulted from asteroid collision

Science|

DateMarch 12, 2012

The physicists prepared a chain of single-atom magnets (red spheres with black arrows indicating north-south orientation) that repel one another, and aligned them (back row) with an external field. By reducing the field, they were able to observe reorientation (front row) caused by the magnetic repulsion (yellow helix) and minute quantum fluctuations. The background shows an image of the individual magnets, each comprising a single atom, as observed in the experiment.

The ‘quantum magnet’

Harvard physicists expand prospects for engineering unusual materials

Science|

DateApril 13, 2011November 13, 2018