The book "Studying the magnetic properties of substances and the phenomenon of hysteresis in ferromagnets" by B. In. Black is a deep and fascinating study devoted to one of the most mysterious and interesting aspects of physics - the magnetic properties of materials, especially in the context of ferromagnets. This work will be of interest to both undergraduate and graduate students studying physics and materials, as well as professional researchers working in the field of materials science and magnetic technologies. In his book, Black not only examines in detail the theoretical foundations of the magnetic properties of substances, but also focuses on the phenomenon of hysteresis, which is key to understanding the behavior of ferromagnets. The reader is immersed in a world of complex physical processes, where each element is explained in accessible language, which makes the material understandable even for those who are just starting their way in the study of physics. The author skillfully combines theory with practical examples, which allows readers to see how these phenomena manifest themselves in real life and how they can be used in various technological applications. The book will be especially useful for undergraduate and graduate students studying physics, materials science, as well as engineers and researchers working in the development of new magnetic materials. It could become a reference book for those interested in modern technologies related to magnetic properties, such as magnetic sensors, hard disks and other devices using ferromagnetic materials. The topics raised in the book go beyond the simple study of magnetic properties. Black studies the influence of various factors on the magnetic behavior of substances, considers methods for measuring and analyzing magnetic properties, and discusses modern advances in magnetic technology. This makes the book relevant and useful for understanding current trends in science and technology. The author's style is distinguished by clarity and logical presentation, which allows readers to easily assimilate complex concepts. In. In. Black is not only the author of this book, but also a recognized specialist in the field of physics, who previously published works on various aspects of materials science and solid state physics. His experience and knowledge make this book a valuable source of information for anyone who wants to deepen their knowledge of the magnetic properties of substances. If you are looking for literature that will not only expand your horizons, but also give practical knowledge, “Study of the magnetic properties of substances and the phenomenon of hysteresis in ferromagnets” will be an excellent choice. This book is not just a textbook - it is the key to understanding the complex physical phenomena that underlie many modern technologies. Do not miss the opportunity to touch the world of physics and materials science, which opens up new horizons for you. Read, explore and be inspired!