11. An extension of this method that allows for internal magnetic charges is used in theories of ferromagnetism . 12. Tonks was employed by General Electric for most of his working life, researching microwaves and ferromagnetism . 13. Ferromagnetism requires electron spins to align, while superconductivity typically requires electron spins to anti-align.14. Early investigations studied the coexistence of conventional " s "-wave superconductivity with itinerant ferromagnetism . 15. A mean-field model for coexistence of spin-triplet pairing and ferromagnetism was developed in 2005, 16. Since 1948 in collaboration with Nikolay Bogoliubov he started to work on quantum theory of ferromagnetism and antiferromagnetism. 17. Compounds at temperatures below the Curie temperature exhibit long-range magnetic order in the form of ferromagnetism . 18. The compound has the unusual property of ferromagnetism , but only if the temperature is below 14 K. 19. Well known examples include the condensation of the Higgs boson in particle physics, and ferromagnetism in condensed matter physics. 20. In his first paper published from Leipzig, Heisenberg used the Pauli exclusion principle to solve the mystery of ferromagnetism .
