Dear Colleagues,

In recent years, various magnetic methods typical for characterization of standard magnetics have been recognized as an efficient research tool in the case of many other groups of materials. These include, among others, intentionally synthesized organometallic compounds (usually based on iron) and industrial side-products (such as fly ashes, air-borne particulate matter, and street dusts), recognized not only as pollutants but also as potential recycling materials. Several questions are crucial and still not entirely understood, e.g.:

• Thermal hysteresis of spin crossover in magneto-organic compounds;
• Relation between spin crossover and the thermochromatic effect;
• Circulation of technogenic magnetic particles in a natural environment;
• Correlation between magnetic iron oxides concentration and heavy metal content.

In dealing with these problems, the magnetic methods—both standard and very specific—seem to be very helpful, such as thermal and frequency scanning of magnetic susceptibility, magneto-optics, magnetic hysteresis decomposition, Day–Dunlop diagrams, and first‐order reversal curve (FORC) analysis. Moreover, a very good supplement to magnetic methods is iron-based Mössbauer spectrometry.

This Special Issue of the Materials journal on "Magnetic Methods in Metalo-Organic Materials and Environmental Science" is intended to be a helpful guide in this comprehensive subject. It will comprise articles with fresh original results, reviews of recent research, short communications, as well as reports on industrial and environmental applications. The topics of submitted contributions can range from fundamental magnetic phenomena in metalo-organic materials and various kinds of environmental samples, via synthesis as well as advanced magnetic and spectroscopic characterization, up to innovative applications and recycling procedures.

Assoc. Prof. Tadeusz Szumiata
Prof. Roman Szewczyk
Guest Editors

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• Metal-organic materials
• Magneto-organic compounds
• Spin crossover
• Thermochromatic effect
• Technogenic magnetic particles
• Environmental dusts and ashes
• Magnetic hysteresis decomposition
• FORC method
• Mössbaurer spectrometry