Journal
APPLIED PHYSICS LETTERS
Volume 121, Issue 15, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0111498
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Funding
- ETH Research Grant
- [ETH-47 17-1]
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The monosulfides of the pyrrhotite omission series are important remanence carriers for paleomagnetic reconstruction, and this study reveals the occurrence of intergrown long-range ordered polytypes and a third constituent that exhibits spin-glass behavior.
The monosulfides of the pyrrhotite omission series ( Fe 1 - x S , 0 < x & LE; 0.125) are important remanence carriers for paleomagnetic reconstruction of the Earth's crust and extraterrestrial materials. The ferrimagnetic Fe 7 S 8 polytypes are the endmembers, and their stacking modulations of full and vacant layers generate different magnetic anisotropy properties due to the cation-vacancy configurations. In this study, intergrown long-range ordered polytypes with four- and threefold modulation, i.e., 4C and 3C pyrrhotite, were prepared in a diffusion-driven process by quenching of a natural pyrrhotite crystal with randomized vacancies. In addition, a third constituent with coherence lengths of a few nanometers, denoted 3C*, was found that exhibits spin-glass behavior at about 10 K due to local magnetic anisotropies arising from vacancy-density variations. The concomitant occurrence of this nano-scale constituent with spin disorder and the long-range ordered polytypes indicate competitive diffusion-driven processes during Fe 7 S 8 formation. Such information provides insight into the provenance and genesis of ferrimagnetic pyrrhotite in Earth and extraterrestrial systems and in a broader sense into vacancy-induced materials. Published under an exclusive license by AIP Publishing.
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