Magnetic and magnetoelastic properties of Cr-substituted cobalt ferrite

Abstract

We have investigated the magnetic and magnetoelasticproperties of a series of Cr-substituted cobaltferriteCoCrxFe2−xO4 (x=0.0-0.79) samples. Substitution of Cr for some of the Fe in cobaltferrite reduced the Curie temperature, and the effect is more pronounced than that observed in Mn-substituted cobaltferrite samples. Cr substitution also caused the maximum magnetostriction to decrease at a greater rate than substitution of the same amount of Mn. The maximum of the strain derivative, dλ/dH, was reached for x=0.38. The behavior of the Curie temperature of Cr-substituted and Mn-substituted cobaltferrites has been analyzed using the Néel molecular field model and compared with recent Mössbauer spectroscopy results. We have investigated the magnetic and magnetoelastic properties of a series of Cr-substituted cobalt ferrite CoCr x Fe 2−x O 4 ͑x = 0.0-0.79͒ samples. Substitution of Cr for some of the Fe in cobalt ferrite reduced the Curie temperature, and the effect is more pronounced than that observed in Mn-substituted cobalt ferrite samples. Cr substitution also caused the maximum magnetostriction to decrease at a greater rate than substitution of the same amount of Mn. The maximum of the strain derivative, d / dH, was reached for x = 0.38. The behavior of the Curie temperature of Cr-substituted and Mn-substituted cobalt ferrites has been analyzed using the Néel molecular field model and compared with recent Mössbauer spectroscopy results.

Magnetic and magnetostrictive properties of aluminium substituted cobalt ferrite synthesized by citrate-gel method

“…However, the highest maximum strain obtained for the sample is very low as 150 ppm. Enhancement in the strain sensitivity is reported after substitution of metal ions in the cobalt ferrite lattice, but at the cost of the magnetostriction strain [13][14][15][16][17]. It has been shown that the strain sensitivity can be enhanced, without affecting the magnetostriction coefficient, for sintered Mn-substituted cobalt ferrite made from nanosized powders [18].…”

Chemical bonding and magnetic properties of gadolinium (Gd) substituted cobalt ferrite

“…Rare-earth ions substitution into Fe 3+ -site in AB 2 O 4 type spinel ferrites has been reported to induce structural distortion and strain and thus significantly modifies the electrical and magnetic properties [16][17][18][19][20][21]. Rare-earth (Ho, Er, Tm, Yb, Lu) ion doping/substitution into cobalt ferrite tend to decrease the room-temperature magnetization as well as the Curie point [22].…”

Influence of calcination temperature on Cd0.3Co0.7Fe2O4 nanoparticles: Structural, thermal and magnetic properties

“…Detailed studies on CoFe 2 O 4 have been carried out by various research groups [14][15][16][17][18][19][20][21][22], but systematic studies on the electrical, magnetic, and thermal studies of nanosized CoFe 2 O 4 are limited. The substitution of other metals in cobalt ferrite has been proposed inorder to tailor the magnetic, electrical, and magnetomechanical properties [15,16]. To the best of our knowledge, limited research groups have been reported on Cd CoFe 2 O 4 system.…”