Invar behavior of fccFe1−xNi

Solid-state synthesis and phase transformations in Ni/Fe films: Structural and magnetic studies

“…As a result, the formation of only paramagnetic phase in the case of Ni concentration $22 at% was observed [24,26]. The decrease of magnetization of Fe 65 Ni 35 films prepared by simultaneous Fe and Ni evaporation from two independently monitoring electron guns onto a substrate at room temperature and subsequently annealed at $900 K4T 3 0 was observed [30,31]. These facts are consistent with our results and also may be associated with the solid-state synthesis at a temperature above T 0 3 .…”

“…These facts are consistent with our results and also may be associated with the solid-state synthesis at a temperature above T 0 3 . Such synthesis leads to the formation of paramagnetic phases between Ni and Fe grains which were not involved in the reaction during the film growth [30,31] or mechanical alloying [22][23][24][25][26][27] of Ni and Fe powders.…”

“…In particular, as-prepared vacuum deposited Fe x Ni 1Àx films (0:31oxo0:39) possess a low thermal expansion coefficient and extended magnetic moment which has no deviation from the Slater-Pauling curve [30,31]. Heating up to $900 K keeps the invar behavior of the samples but also reduces the saturation magnetization and Curie temperature [31].…”

Stress-induced large Curie temperature enhancement inFe64Ni36Invar alloy

“…33 In a previous work, we shown that the magnitude of the Curie temperature, T C , of an standard commercial Fe 64 Ni 36 powder sample can be increased in ⌬T C ϳ70 K, by means of a severe mechanical processing, using a high-energy ball mill, followed by a heating up to 1073 K, while the invar character is maintained and its temperature range enlarged as well. 34 Previously, Dumpich et al 35 already observed in "asprepared" Fe 65 Ni 35 evaporated thin films an increase in the T C value of ca 200 K, accompanied by an enhancement of 20% in the saturation magnetization, M s . However, both T C and M s drop down to the corresponding bulk values after annealing of the thin films.…”

Structural and magnetic features of the solid-state synthesis and martensitic transformations in Ni/Fe(001)/MgO(001) thin films

“…Invar Ni 1-x Fe x (x$0.65) alloys with the practically zero temperature extension coefficients have been known for more than a century; however, the ''Invar Problem'' remains the subject of intense experimental [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] and theoretical [17][18][19][20][21][22][23][24][25][26] studies. Starting from Weiss's works [17], 2g-state models have been developed.…”