Magnetism and site occupancy in epitaxial Y-rich yttrium iron garnet films

Magnetism and site occupancy in epitaxial Y-rich yttrium iron garnet films
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外延富 Y 钇铁石榴石薄膜的磁性和位点占据

DOI:
10.1103/physrevmaterials.5.094403
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发表时间:
2021
影响因子:
3.4
通讯作者:
Ross, Caroline A.
Ross, Caroline A.
中科院分区:
材料科学3区
文献类型:
--
作者:
Su, Tingyu;Ning, Shuai;Cho, Eunsoo;Ross, Caroline A.

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Y-rich yttrium iron garnet (Y-YIG) thin films were grown on gadolinium gallium garnet substrates using pulsed laser deposition from atarget. The films are epitaxial on the substrate, and the unit cell of (001)- and (111)-oriented Y-YIG undergoes a tetragonal or rhombohedral distortion, respectively. The Y-YIG has lower room temperature magnetization but higher low-temperature magnetization than bulk YIG, and its Curie temperature was in the range of 330–400 K, depending on the growth conditions. First-principles calculations predict thatantisite defects are more stable in octahedral than tetrahedral Fe sites. Temperature-dependent magnetization measurements together with a superexchange dilution model and composition determined from x-ray photoelectron spectroscopy indicate that nonmagnetic species (and vacancies) are predominantly accommodated in the octahedral sites, but there is a significant occupancy of tetrahedral sites.
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