Ceramics with magnetic property are called ferrites. Ferrites are classified into two categories, namely hard ferrites with a permanent magnetism and soft ferrites with easier control of magnetism. Since soft ferrites can convert between electric and magnetic energies bi-directionally, we can utilize them to control the magnetic environment of electronic devices electrically. Murata applied this property of soft ferrite to noise suppression components to develop various EMI (electromagnetic interference) filters (EMIFIL®) and microwave absorbers. Murata also applied the nonreversible property of ferrite to develop products such as mobile phone isolators.