Physics

Laser-driven spin dynamics in ferrimagnets: How does the angular momentum flow?

A team of researchers has now been able to follow the flow of angular momentum during ultrafast optical demagnetization in a ferrimagnetic iron-gadolinium alloy in great detail, in order to understand the fundamental processes and their speed limits.

Promising material could lead to faster, cheaper computer memory

Computer memory could become faster and cheaper thanks to research into a promising class of materials by University of Arkansas physicists.

Transforming waste heat into clean energy

Through a mechanism known as the Spin Hall effect, it has been shown that a voltage can be generated by harnessing differences in spin populations on a metal contact attached to a ferromagnetic material. Researchers used supercomputers to identify various forms of cobalt oxide combined with nickel and zinc that show promise for thermoelectric generation by taking advance of the Spin Hall effect.

Nuclear 'magic numbers' collapse beyond the doubly magic nickel 78

Scientists from the RIKEN Nishina Center for Accelerator-Based Research and collaborators have used the center's heavy ion accelerator, the RI Beam Factory, to demonstrate that nickel-78, a neutron-rich "doubly magic" isotope of nickel with 28 protons and 50 neutrons, still maintains a spherical shape that makes it relatively stable despite the large imbalance in the number of protons and neutrons. They also discovered a surprise—observations from the experiment suggest that nickel-78 may be the lightest nucleus with 50 neutrons to have a magic nature.

Transforming waste heat into clean energy

Do you feel the warmth coming off your computer or cell phone? That's wasted energy radiating from the device. With automobiles, it is estimated that 60% of fuel efficiency is lost due to waste heat. Is it possible to capture this energy and convert it into electricity?

New research may be used to treat cancer, heal combat wounds

Army research is the first to develop computational models using a microbiology procedure that may be used to improve novel cancer treatments and treat combat wounds.

Why a drop of oil bounces in a water/ethanol gradient and eventually falls to the bottom of a jar

A team of researchers working at the University of Twente has solved the mystery of why a drop of oil bounces repeatedly when dropped in a water/ethanol gradient but eventually falls to the bottom of a jar. In their paper published in the journal Physical Review Letters, the group describes their study of the odd behavior.

Searching for lost WWII-era uranium cubes from Germany

Researchers are piecing together what exactly happened to hundreds of cubes of uranium from a secretive and ultimately failed effort to build a working nuclear reactor in Nazi Germany during World War II.

Searching for lost WWII-era uranium cubes from Germany

Back in 2013, Timothy Koeth, an associate research professor at the University of Maryland, received a rather extraordinary birthday gift: a little cloth lunch pouch containing a small object wrapped in brown paper towels. As Koeth peeled back the layers, his eyes grew wide with astonishment. He immediately asked, "Where did you get that?"

The Moon is Finally Getting the Attention It Deserves

We've reached another "will they or won't they?" cliffhanger in the long-running soap opera, When Will Humans Return to the Moon? Last May, NASA administrator Jim Bridenstine promised that a crew would be landing there by 2028. "To many, this may sound similar to our previous attempts to get to the Moon," he admitted. "However, times have changed. This will not be Lucy and the football again." A month ago, Vice President Pence added a big plot twist, now declaring that "it is the stated poli

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