Ministry of Earth Sciences Hosts National Media Interaction on 'Mission Mausam' The Ministry of Earth Sciences (MoES) held a national-level media interaction on the ambitious Mission Mausam at Prithvi Bhavan, New Delhi. The session was led by Dr. M Ravichandran, Secretary of MoES, alongside Dr. Mritunjay Mohapatra, Director General of the India Meteorological Department (IMD), and Dr. V.S. Prasad, Head of the National Centre for Medium-Range Weather Forecasting (NCMRWF). Approved by the Union Cabinet on September 11, 2024, with a budget of ₹2,000 crores over two years, Mission Mausam aims to transform India into a "Weather-Ready" and "Climate-Smart" nation. The mission focuses on advancing the country's weather and climate observation, modeling, and forecasting capabilities, to provide more accurate and timely services. Key Objectives of Mission Mausam: Develop Cutting-Edge Technologies: Introduce next-generation radars, satellites with advanced instr...
A recent study has unveiled a surprising phenomenon in magnetic materials that resembles the well-known Mpemba effect previously observed in liquids. This effect, which is named after Erasto Mpemba who rediscovered it in the 1960s, describes how a hotter liquid can sometimes cool or freeze faster than a colder one under certain conditions. Historically attributed to Aristotle, this paradoxical behavior has now been identified in the realm of magnetism.
The study focuses on the transition of materials from a paramagnetic phase to a ferromagnetic phase. In a paramagnetic state, materials exhibit a weak, temporary attraction to magnetic fields due to randomly aligned atomic magnets. In contrast, a ferromagnetic phase is characterized by a strong, permanent attraction due to the ordered alignment of atomic magnets, resulting in a net magnetization.
Researchers from the Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) have found that hotter paramagnets, contrary to expectations, transition to their ferromagnetic phase faster than cooler ones. This phenomenon was observed through experiments on model magnetic systems undergoing transitions near a critical temperature known as the Curie point.
The researchers discovered that this "Mpemba effect in magnets" occurs because the initial state of a hotter paramagnet tends to have less spatial correlation among atomic magnets compared to a cooler one. As the system cools down, it transitions to the ferromagnetic phase more rapidly because the initial state with less correlation requires less time to reorganize and reach the final ordered state.
This intriguing result provides new insights into critical phenomena and suggests that similar effects could be present in a variety of systems beyond magnets, potentially influencing thermal control technologies and cooling strategies. The findings might also offer valuable perspectives on dynamics in other fields, such as epidemiology, where understanding the speed of transitions could inform strategies for managing outbreaks.
Overall, the study not only sheds light on fundamental aspects of magnetic transitions but also opens up possibilities for practical applications and further research into critical phenomena across different domains.
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