Ferrimagnetic and Metallic Properties of (001) NiCo₂O₄ Films Fabricated at Various Oxygen Pressures

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetics Pub Date : 2023-06-30 DOI:10.4283/jmag.2023.28.2.102

Jungbae Kim, Yeon Jung Park, J. Dho

{"title":"Ferrimagnetic and Metallic Properties of (001) NiCo₂O₄ Films Fabricated at Various Oxygen Pressures","authors":"Jungbae Kim, Yeon Jung Park, J. Dho","doi":"10.4283/jmag.2023.28.2.102","DOIUrl":null,"url":null,"abstract":"Epitaxial (001) NiCo 2 O 4 films with perpendicular magnetic anisotropy were grown on (001) MgAl 2 O 4 at various oxygen pressures of 10-200 mTorr using pulsed laser deposition. X-ray diffraction suggested that the lattice constant, crystallinity, and deposition rate displayed distinctive changes around 50 mTorr. The temperature-dependent resistance displayed an insulating behavior in the films grown below 15 mTorr but a metallic one in the films grown above 20 mTorr. Magneto-optical Kerr effect measurement suggested that the NiCo 2 O 4 films grown above 15 mTorr are ferrimagnetic at room temperature and possess a distinctive perpendicular magnetic anisotropy. The ferrimagnetic-to-paramagnetic transition temperature reached a maximum of ~385 K at 50 mTorr. During the magnetic reversal, the density of small nucleated domains increased with increasing oxygen pressure from 20 to 200 mTorr, and exhibited metallic ferrimagnetism at room temperature. Consequently, the optimal growth condition for magnetic device applications of NiCo 2 O 4 films is believed to be 50-200 mTorr at 320 ℃.","PeriodicalId":16147,"journal":{"name":"Journal of Magnetics","volume":"191 1","pages":""},"PeriodicalIF":0.6000,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Magnetics","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.4283/jmag.2023.28.2.102","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Epitaxial (001) NiCo 2 O 4 films with perpendicular magnetic anisotropy were grown on (001) MgAl 2 O 4 at various oxygen pressures of 10-200 mTorr using pulsed laser deposition. X-ray diffraction suggested that the lattice constant, crystallinity, and deposition rate displayed distinctive changes around 50 mTorr. The temperature-dependent resistance displayed an insulating behavior in the films grown below 15 mTorr but a metallic one in the films grown above 20 mTorr. Magneto-optical Kerr effect measurement suggested that the NiCo 2 O 4 films grown above 15 mTorr are ferrimagnetic at room temperature and possess a distinctive perpendicular magnetic anisotropy. The ferrimagnetic-to-paramagnetic transition temperature reached a maximum of ~385 K at 50 mTorr. During the magnetic reversal, the density of small nucleated domains increased with increasing oxygen pressure from 20 to 200 mTorr, and exhibited metallic ferrimagnetism at room temperature. Consequently, the optimal growth condition for magnetic device applications of NiCo 2 O 4 films is believed to be 50-200 mTorr at 320 ℃.

查看原文本刊更多论文

不同氧压下制备的(001)NiCo₂O₄薄膜的铁磁和金属性能

在10-200 mTorr的不同氧压下，利用脉冲激光沉积技术在(001)mgal2o4上生长出具有垂直磁各向异性的(001)nico2o4外延膜。x射线衍射表明，在50 mTorr附近，晶格常数、结晶度和沉积速率发生了明显的变化。温度相关电阻在低于15 mTorr的薄膜中表现为绝缘行为，而在高于20 mTorr的薄膜中表现为金属绝缘行为。磁光克尔效应测量表明，生长在15mtorr以上的nico2o4薄膜在室温下具有铁磁性，并具有明显的垂直磁各向异性。在50 mTorr下，铁磁到顺磁的转变温度达到了~385 K的最大值。在磁反转过程中，小核畴的密度随氧压的增加而增大，在室温下表现为金属铁磁性。因此，nico2o4薄膜的最佳生长条件为50 ~ 200 mTorr，温度为320℃。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Magnetics MATERIALS SCIENCE, MULTIDISCIPLINARY-PHYSICS, APPLIED

CiteScore

1.00

自引率

20.00%

发文量

审稿时长

2.3 months

期刊介绍： The JOURNAL OF MAGNETICS provides a forum for the discussion of original papers covering the magnetic theory, magnetic materials and their properties, magnetic recording materials and technology, spin electronics, and measurements and applications. The journal covers research papers, review letters, and notes.