Nota de FísicaPublicado
Magnetic Properties of the Pseudo-binary Intermetallic Compounds:
Luiz C. Sampaio; S.F. da Cunha
1991
Dados da publicação
- Autores
- Luiz C. Sampaio; S.F. da Cunha
- Tipo
- Nota de Física
- Status
- Publicado
- Data de publicação
- 1991
- Descrição
- From magnetization measurements in policrystalline <math>Hf(Fe_ {1-x}Al_{x})_{2}\,\!</math> samples, it was observed that the magnetization is not saturated even at high fields <math>(70\,\!</math> <math> kOe)\,\!</math>. It is suggested that in <math>Hf(Fe_ {1-x}Al_{x})_{2}\,\!</math> , a high anisotropy energy and consequently narrow domain walls exist. Magnetization vs. temperature curves present a different behaviour if the sample is cooled with field <math>(FC)\,\!</math> or without <math>(ZFC)\,\!</math> field. This difference is applied field dependent and is a maximum in the range <math>0.45 < x < 0.50.\,\!</math> The <math>ZFC\,\!</math> curve is irreversible with temperature while <math>FC\,\!</math> is reversible. In the intermediate concentration range, the coercive field decreases rapidly with temperature. These behaviour can be explained by domain wall pinning and not by spin or cluster glass effects. In the magnetic phase diagram, <math>(T_C\,\!</math> <math> vs\,\!</math> <math>x )\,\!</math> two different slopes were found and <math>T_C\,\!</math> vanishes <math>at\,\!</math> <math> x = 0.63\,\!</math>, approximately. To compare <math>Hf(Fe_ {1-x}Al_{x})_{2}\,\!</math> and <math>Zr(Fe_{1-x}Al_{x})_{2}\,\!</math> results, we performed the same measurements on a <math>Zr(Fe_{0.68}Al_{0.32})_{2}\,\!</math> sample and found a similar irreversibility of <math>ZFC\,\!</math> magnetization which has not been detected in the literature.
- Ano
- 1991
- Número
- CBPF-NF-016/91
- Vínculo com tese
- Não
- Vínculo com bolsa
- Não