Magnetic properties of CeFe11−xCoxTi with ThMn12 structure

Abstract

A series of novel alloys CeFe11−xCoxTi (0 ≤ x ≤ 11) with ThMn12 structure has been successfully prepared by melt-spinning. The Curie temperature Tc increases with Co content x, reaching a maximum of 689 °C at x = 9 and declining to 664 °C at complete Co filling (x = 11). The room temperature saturation magnetization 4πMs and magnetocrystalline anisotropy Ha have been estimated by fitting the first quadrant demagnetization curve with the Stoner-Wohlfarth model. 4πMs first increases with increasing Co up to x = 3, then decrease. Ha has a complex dependence on Co content, which is indicative of a change in the easy magnetization direction from axis to plane and back as the Co content increases.

Low-cost Ce1-xSmx(Fe, Co, Ti)12 alloys for permanent magnets

“…5 (≈ 40 kOe) and a significantly lower value suggested in Ref. 4 (≈ 15 kOe). The latter H a value, if correct, would make it extremely difficult to obtain a reasonably high intrinsic coercivity H c .…”

“…[1][2][3][4][5][6] One material of interest is Ce(Fe,Co) 11 Ti that crystallizes in the tetragonal structure of ThMn 12 type (hereafter, "1:12"); the T C , M s and also the anisotropy field H a of this compound suggest a possibility to develop it into a medium-grade permanent magnet. [4][5][6] A significant discrepancy, however, exists between the H a reported for the most promising CeFe 9 Co 2 Ti composition in Ref. 5 (≈ 40 kOe) and a significantly lower value suggested in Ref.…”

Intrinsic magnetic properties inR(Fe1−xCox)11TiZ(R=Ke1, Johnson2 2016Phys. Rev. B413120View full textAdd to dashboardCite

“…[8] Pure phase R(Fe 1−x Co x ) 11 Ti exists over the whole composition range for both R=Y and Ce. [17] The largest magnetization in Y(Fe 1−x Co x ) 11 Ti occurs at YFe 8 Co 3 Ti while the T C increases continuously with Co composition until it reaches the maximum in YCo 11 Ti. [18,19] For Ce compounds, the maximum T C is obtained in CeFe 2 Co 9 Ti.…”

“…[17] The dependence of MAE on the Co composition in R(Fe 1−x Co x ) 11 Ti is more intriguing and not understood. Although early experiments [8,14] suggested that YCo 11 Ti has a planar anisotropy, later experiments agreed that YCo 11 Ti has uniaxial anisotropy, [17][18][19][20][21][22][23] but with a magnitude smaller than those of YFe 11 Ti. For the intermediate Co composition, anisotropy changes from uniaxial to planar and then back to uniaxial with the increase of Co composition in both of Y(Fe 1−x Co x ) 11 Ti and Ce(Fe 1−x Co x ) 11 Ti.…”

Intrinsic Magnetic Properties of Ce2Fe14B Modified by Al, Ni, or Si

“…The low cost and availability of Ce have driven interest in developing Ce-based permanent magnets to replace expensive Nd 2 Fe 14 B magnets in certain applications [7][8][9][10][11][12][13][14][15][16][17][18][19]. This has resulted in investigation of Ce 2 Fe 14 B and its alloys [20][21][22][23][24][25][26].…”