Abstract
Magnetization and magnetostriction data are reported for discontinuous type exchange-spring Tb(Fe 0.55Co 0.45) 1.5/(Y 0.1Fe 0.9) multilayers, in which nanograins coexist with amorphous phase in soft YFe layers. This novel exchange-spring configuration exhibits an excellent magnetic and magnetostrictive softness: low magnetic coercivity ( μ 0 H C = 1 mT ) , large magnetostriction ( λ γ , 2 = 720 × 1 0 - 6 ) and large parallel magnetostrictive susceptibility ( χ λ | | = d λ | | / d μ 0 H = 29.7 × 1 0 - 2 T - 1 ) . In addition, the observed phenomena of the negative contribution to magnetostriction, the formation of the extended domain wall at the interfaces and the exchange-bias are discussed.
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