{"title":"锶铁氧体细颗粒的磁后效应和磁化反转","authors":"H. Nishio;H. Taguchi;F. Hirata;T. Takeishi","doi":"10.1109/TJMJ.1994.4565938","DOIUrl":null,"url":null,"abstract":"the magnetic aftereffect constant (S\n<sub>v</sub>\n), the anisotropy field (H\n<sub>A</sub>\n) distribution and the rotational hysteresis integral (R\n<sub>h</sub>\n) were measured for M-type hexagonal strontium ferrite (SrM) fine particles with various average particle diameters (D) and coercive forces (H\n<sub>cJ</sub>\n). The relations between S\n<sub>v</sub>\n, the activation volume (v), H\n<sub>cJ</sub>\n, H\n<sub>A</sub>\n, and R\n<sub>h</sub>\n were studied, as well as the effect of milling. S\n<sub>v</sub>\n is constant and independent of the magnetic field. In S\n<sub>v</sub>\n varies in proportion to In H\n<sub>cJ</sub>\n, and the relation H\n<sub>cJ</sub>\n∝v\n<sup>-2</sup>\n was found to obtain in SrM particles not extensively subjected to milling. S\n<sub>v</sub>\n increases and v decreases for SrM fine particles (D=0.3 μm) whose H\n<sub>A</sub>\n is widely distributed by milling, even though H\n<sub>cJ</sub>\n decreases markedly. S\n<sub>v</sub>\n and v are related to the distribution of H\n<sub>A</sub>\n. As H\n<sub>cJ</sub>\n increases, R\n<sub>h</sub>\n and v decrease, which indicates that the magnetization reversal mechanism of SrM fine particles approaches that of a coherent rotation mode.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 5","pages":"144-149"},"PeriodicalIF":0.0000,"publicationDate":"1994-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565938","citationCount":"2","resultStr":"{\"title\":\"Magnetic Aftereffect and Magnetization Reversal of Sr-Ferrite Fine Particles\",\"authors\":\"H. Nishio;H. Taguchi;F. Hirata;T. Takeishi\",\"doi\":\"10.1109/TJMJ.1994.4565938\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"the magnetic aftereffect constant (S\\n<sub>v</sub>\\n), the anisotropy field (H\\n<sub>A</sub>\\n) distribution and the rotational hysteresis integral (R\\n<sub>h</sub>\\n) were measured for M-type hexagonal strontium ferrite (SrM) fine particles with various average particle diameters (D) and coercive forces (H\\n<sub>cJ</sub>\\n). The relations between S\\n<sub>v</sub>\\n, the activation volume (v), H\\n<sub>cJ</sub>\\n, H\\n<sub>A</sub>\\n, and R\\n<sub>h</sub>\\n were studied, as well as the effect of milling. S\\n<sub>v</sub>\\n is constant and independent of the magnetic field. In S\\n<sub>v</sub>\\n varies in proportion to In H\\n<sub>cJ</sub>\\n, and the relation H\\n<sub>cJ</sub>\\n∝v\\n<sup>-2</sup>\\n was found to obtain in SrM particles not extensively subjected to milling. S\\n<sub>v</sub>\\n increases and v decreases for SrM fine particles (D=0.3 μm) whose H\\n<sub>A</sub>\\n is widely distributed by milling, even though H\\n<sub>cJ</sub>\\n decreases markedly. S\\n<sub>v</sub>\\n and v are related to the distribution of H\\n<sub>A</sub>\\n. As H\\n<sub>cJ</sub>\\n increases, R\\n<sub>h</sub>\\n and v decrease, which indicates that the magnetization reversal mechanism of SrM fine particles approaches that of a coherent rotation mode.\",\"PeriodicalId\":100647,\"journal\":{\"name\":\"IEEE Translation Journal on Magnetics in Japan\",\"volume\":\"9 5\",\"pages\":\"144-149\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1994-09-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565938\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IEEE Translation Journal on Magnetics in Japan\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://ieeexplore.ieee.org/document/4565938/\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Translation Journal on Magnetics in Japan","FirstCategoryId":"1085","ListUrlMain":"https://ieeexplore.ieee.org/document/4565938/","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Magnetic Aftereffect and Magnetization Reversal of Sr-Ferrite Fine Particles
the magnetic aftereffect constant (S
v
), the anisotropy field (H
A
) distribution and the rotational hysteresis integral (R
h
) were measured for M-type hexagonal strontium ferrite (SrM) fine particles with various average particle diameters (D) and coercive forces (H
cJ
). The relations between S
v
, the activation volume (v), H
cJ
, H
A
, and R
h
were studied, as well as the effect of milling. S
v
is constant and independent of the magnetic field. In S
v
varies in proportion to In H
cJ
, and the relation H
cJ
∝v
-2
was found to obtain in SrM particles not extensively subjected to milling. S
v
increases and v decreases for SrM fine particles (D=0.3 μm) whose H
A
is widely distributed by milling, even though H
cJ
decreases markedly. S
v
and v are related to the distribution of H
A
. As H
cJ
increases, R
h
and v decrease, which indicates that the magnetization reversal mechanism of SrM fine particles approaches that of a coherent rotation mode.