ROLES OF GRAIN-SIZE AND STRAIN ON ANTIFERROMAGNETIC ORDER IN NANOCRYSTALLINE CHROMIUM

被引：18

作者：

FITZSIMMONS, MR ^{[1
]}

EASTMAN, JA ^{[1
]}

VONDREELE, RB ^{[1
]}

THOMPSON, LJ ^{[1
]}

机构：

[1] ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 08期

关键词：

D O I：

10.1103/PhysRevB.50.5600

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Neutron-diffraction investigations of powder and consolidated ultrafine-grain-sized chromium samples indicated that antiferromagnetic order in the body-centered-cubic phase of this material can be suppressed to well below the Neel temperature of coarse-grained and single-crystal chromium. The suppression is correlated strongly with decreasing grain size. Antiferromagnetic order was not observed in powder or in consolidated samples with grain sizes less than 16 nm, indicating that free surfaces and grain boundaries play the same role in preventing antiferromagnetic order with the structure of bulk chromium. Antiferromagnetic order was observed in nanocrystalline samples with grain sizes greater than 19 nm at 20 K. No correlation is seen between the Neel temperature and the degree of long-range microstrain, or with contents of light-element impurities in the samples. Even in cases where antiferro-magnetic order is detected, the transversely polarized AF1 spin-density-wave magnetic phase is never seen. While this may suggest that spin-density-wave phases do not occur in nanocystalline chromium, the presence of the longitudinally polarized AF2 spin-density-wave phase cannot be ruled out unambiguously.

引用

页码：5600 / 5608

页数：9

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