Magnetic properties of compounds R2Fe14B

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Abstract
A spin reorientation occurs in Nd2Fe14B starting around Ts= 150 K. We present data on tendencies in spin reorientations in systems (Nd1−xRx)2Fe14B and Nd2Fe14−xAxB where R=different rare earths and A=Co, Al. The insensitivity of Ts to some of these substitutions appears to indicate that Nd alone is responsible for the transition. We discuss a model according to which this transition may be triggered primarily by a competition amongst the anisotropies of the two Nd sites. According to a crystal field analysis the Nd 4f site should be more susceptible to plane preference while the Nd 4g site should have axial anisotropy. At lower temperatures the 4f site gains in relative importance and triggers the spin reorientation. The absence of a similar spin reorientation in analogous systems however indicates a complex situation.